Russian phonology

This article discusses the phonological system of standard Russian based on the Moscow dialect. For an overview of dialects in the Russian language, see Russian dialects. Most descriptions of Russian describe it as having five vowel phonemes, though there is some dispute over whether a sixth vowel,, is separate from. Russian has 34 consonants, which can be divided into two types:hard or plainsoft or palatalized
Russian also distinguishes hard consonants from soft consonants and from consonant+ clusters, making four sets in total:, although in native words appears only at morpheme boundaries. Russian also preserves palatalized consonants that are followed by another consonant more often than other Slavic languages do. Like Polish, it has both hard postalveolars and soft ones.
Russian has vowel reduction in unstressed syllables. This feature also occurs in a minority of other Slavic languages like Belarusian and Bulgarian and is also found in English, but not in most other Slavic languages, such as Czech, Polish, most varieties of Serbo-Croatian, and Ukrainian.

Vowels

Russian has five to six vowels in stressed syllables, and in some analyses, but in most cases these vowels have merged to only two to four vowels when unstressed: after hard consonants and after soft ones.
A long-standing dispute among linguists is whether Russian has five vowel phonemes or six; that is, scholars disagree as to whether constitutes an allophone of or if there is an independent phoneme. The five-vowel analysis, taken up by the Moscow school, rests on the complementary distribution of and, with the former occurring after hard consonants and after soft consonants. The allophony of the stressed variant of the open is largely the same, yet no scholar considers and to be separate phonemes.
The six-vowel view, held by the Saint-Petersburg phonology school, points to several phenomena to make its case:

Native Russian speakers' ability to articulate in isolation: for example, in the names of the letters and.
Rare instances of word-initial, including the minimal pair и́кать 'to produce the sound и' and ы́кать 'to produce the sound ы', as well as borrowed names and toponyms, like Ыб, the name of a river and several villages in the Komi Republic.
Morphological alternations between non-palatalized consonants without any following vowel or before ы and palatalized consonants before и, like гото́в, гото́вый, and гото́вить, signifying that и palatalizes an inherently non-palatalized underlying consonant while ы does not.

The most popular view among linguists is that of the Moscow school, though Russian pedagogy has typically taught that there are six vowels.
Reconstructions of Proto-Slavic show that *i and *y were separate phonemes. On the other hand, after the first palatalization, Old East Slavic *i and *y contrasted only after alveolars and labials: after palatals only *i occurred, and after velars only *y occurred. With the development of phonemic palatalized alveolars and labials, *i and *y no longer contrasted in any environment and were reinterpreted as allophones of each other, becoming a single phoneme /i/. Even so, this reinterpretation entailed no mergers and no change in the pronunciation. Subsequently, sometime between the twelfth and fourteenth centuries, the allophone of /i/ occurring after a velar consonant changed from to with subsequent palatalization of the velar, turning old Russian хытрыи into modern хитрый and old гыбкыи into modern гибкий.

Allophony

Russian vowels are subject to considerable allophony, subject to both stress and the palatalization of neighboring consonants. In most unstressed positions, in fact, only three phonemes are distinguished after hard consonants, and only two after soft consonants. Unstressed and have merged to ; unstressed and have merged to ; and all four unstressed vowels have merged after soft consonants, except in the absolute final position in a word. None of these mergers are represented in writing.

Front vowels

When a preceding consonant is hard, is retracted to. Formant studies in demonstrate that is better characterized as slightly diphthongized from the velarization of the preceding consonant, implying that a phonological pattern of using velarization to enhance perceptual distinctiveness between hard and soft consonants is strongest before. When unstressed, becomes near-close; that is, following a hard consonant and in most other environments. Between soft consonants, stressed is raised, as in пить . When preceded and followed by coronal or dorsal consonants, is fronted to. After a cluster of a labial and, is retracted, as in плыть ; it is also slightly diphthongized to.
In native words, only follows unpaired and soft consonants. After soft consonants, it is a mid vowel, while a following soft consonant raises it to close-mid. Another allophone, an open-mid, occurs word-initially and between hard consonants. Preceding hard consonants retract to and so that жест and цель are pronounced and respectively.
In words borrowed from other languages, often follows hard consonants; this foreign pronunciation usually persists in Russian for many years until the word is more fully adopted into Russian. For instance, шофёр was pronounced in the early twentieth century, but is now pronounced. On the other hand, the pronunciations of words such as отель retain the hard consonants despite a long presence in the language.

Back vowels

Source:
Between soft consonants, becomes, as in пять . When not following a soft consonant, is retracted to before /ɫ/ as in палка .
For most speakers, is a mid vowel, but it can be a more open for some speakers. Following a soft consonant, is centralized and raised to as in тётя . More recently has been described as "a diphthongoid, with a closer lip rounding at the beginning of the vowel that gets progressively weaker or even, particularly when occurring word-initially or word-finally under the stress". This phenomenon does not seem to be a recent development because the diphthongal nature of /o/ under stress has already been described in 1969.
As with the other back vowels, is centralized to between soft consonants, as in чуть . When unstressed, becomes near-close; central between soft consonants, centralized back in other positions.

Unstressed vowels

Russian unstressed vowels have lower intensity and lower energy. They are typically shorter than stressed vowels, and in most unstressed positions tend to undergo mergers for most dialects:

has merged with : for instance, валы́ 'bulwarks' and волы́ 'oxen' are both pronounced .
has merged with : for instance, лиса́ 'vixen' and леса́ 'fishing line' are both pronounced ; however, ли́сы 'vixens' is pronounced while ле́сы 'fishing-lines' is pronounced .
and have merged with after soft consonants: for instance, 'month' is pronounced, phonetically.

The merger of unstressed and in particular is less universal in the pretonic position than that of unstressed and. For example, speakers of some rural dialects as well as the "Old Petersburgian" pronunciation may have the latter but not the former merger, distinguishing between лиса́ and леса́, but not between валы́ and волы́. The distinction in some loanwords between unstressed and, or and is codified in some pronunciation dictionaries, for example, фо́рте and ве́то.
Unstressed vowels are preserved word-finally, for example in second-person plural or formal verb forms with the ending -те, such as . The same applies for vowels starting a word.
As a result, in most unstressed positions, only three vowel phonemes are distinguished after hard consonants, and only two after soft consonants. For the most part, Russian orthography does not reflect vowel reduction. This can be seen in, for examples:

Russian "village" and сёлa "villages" — cf. Belarusian and сёлы. Russian unstressed ё is written as if it were, ⟨e⟩, while Belarusian unstressed ё is transparently written as ⟨я⟩.
Russian "tomcat" and "tomcats" — cf. Belarusian and . Russian unstressed morphophonemic is written as if it were still, ⟨о⟩, while Belarusian unstressed morphophonemic is transparently written as ⟨а⟩.
* There exist some exceptional Russian words whose original was and is never stressed across the words' entire inflectional paradigms and thus pronounced or, and then is rewritten as ; for instances:
** паро́м, which is from Proto-Slavic *pormъ;
** карава́й, which is from PSl. *korvajь etc.
* Spelling those words with ⟨а⟩ was already common in the 18th century, but it co-existed with the spelling with ⟨о⟩, conforming to etymology of those words. Dictionaries often gave both spellings. Finally the spelling of those words with ⟨а⟩ was set by the 1956 orthographic codification, based on the spread of usage.
Vowel mergers

In terms of actual pronunciation, there are at least two different levels of vowel reduction: vowels are less reduced when a syllable immediately precedes the stressed one, and more reduced in other positions. This is particularly visible in the realization of unstressed and, where a less-reduced allophone appears alongside a more-reduced allophone.
The pronunciation of unstressed is as follows:

appears in the following positions:
* In the syllable immediately before the stress, when a hard consonant precedes: e.g. наро́д, моро́з, дрова́, and трава́ .
* In absolute word-initial position: e.g. аванга́рд, огоро́д .
* In hiatus, when the vowel occurs twice without a consonant between; this is written,,, or : сообража́ть .
appears elsewhere, when a hard consonant precedes: о́блако, я́года .
* In absolute word-final position, may occur instead, especially at the end of a syntagma.
When a soft consonant or precedes, both and merge with and are pronounced as. Example: язы́к, ежи́ .
* This merger also tends to occur after formerly soft consonants now pronounced hard, where the pronunciation occurs; e.g. шевели́ть 'to stir ~ to move ~ to bulge'. This always occurs when the spelling uses the soft vowel variants, e.g. жена́ vs. жёны ' vs. шоки́ровать 'to shock. However, also occurs in a few word roots where the spelling writes a hard. Examples:
** жаль 'regret', whence жале́ть, к сожале́нию .
** ло́шадь ~, whence лошаде́й, .
** -дцать- in numbers: e.g. двадцати́, тридцатью́ .
** ржано́й ~ .
** жасми́н ~ .
* After those now-hardened formerly-soft consonants and in word-final position, unstressed and unstressed merge and are pronounced, as in:
** пыльца́ vs. уби́йца,
** строжа́йше vs. хорошо́,
** похо́же, vs. свежо́, and
** де́ревце vs. its synonym деревцо́.
** Yet word-final unstressed after and is also pronounced by some speakers: e.g. строжа́йше, похо́же.
These processes occur even across word boundaries as in под морем .

The pronunciation of unstressed is after soft consonants and, and word-initially ; икра́ ; диви́ть, but after hard consonants.
There are a number of exceptions to the above vowel-reduction rules:

Vowels may not merge in foreign borrowings, particularly with unusual or recently borrowed words such as ра́дио, 'radio'. In such words, unstressed may be pronounced as, regardless of context; unstressed does not merge with in initial position or after vowels, so word pairs like эмигра́нт and иммигра́нт, or эмити́ровать and имити́ровать, differ in pronunciation.
Across certain word-final inflections, the reductions do not completely apply. For example, after soft or unpaired consonants, unstressed, and of a final syllable may be distinguished from each other. For example, жи́тели contrasts with both жи́теле and жи́теля . Also, хо́дит and хо́дят .
If the vowel belongs to the conjunctions но or то, it is not reduced, even when unstressed.
Other changes

Unstressed is generally pronounced as a lax, e.g. мужчи́на . Between soft consonants, it becomes centralized to, as in юти́ться .
Note a spelling irregularity in of the reflexive suffix -ся: with a preceding -т- in third-person present and a -ть- in infinitive, it is pronounced as, i.e. hard instead of with its soft counterpart, since, normally spelled with, is traditionally always hard. In other forms both pronunciations and alternate for a speaker with some usual form-dependent preferences: in the outdated dialects, reflexive imperative verbs may be pronounced with instead of modern . In adverbial participles ending on -я́сь or -а́сь, books on Russian standard pronunciation prescribe as the only correct variant.
In weakly stressed positions, vowels may become voiceless between two voiceless consonants: вы́ставка, потому́ что . This may also happen in cases where only the following consonant is voiceless: че́реп .

Phonemic analysis

Because of mergers of different phonemes in unstressed position, the assignment of a particular phone to a phoneme requires phonological analysis. There have been different approaches to this problem:

The Saint Petersburg phonology school assigns allophones to particular phonemes. For example, any is considered as a realization of.
The Moscow phonology school uses an analysis with morphophonemes. It treats a given unstressed allophone as belonging to a particular morphophoneme depending on morphological alternations. For example, is analyzed as either or. To make a determination, one must seek out instances where an unstressed morpheme containing in one word is stressed in another word. Thus, because the word shows an alternation with, this instance of belongs to the morphophoneme. Meanwhile, alternates with, showing that this instance of belongs to the morphophoneme. If there are no alternations between stressed and unstressed syllables for a particular morpheme, then no assignment is made, and existence of an archiphoneme is postulated. For example, the word is analysed as, where is an archiphoneme.
Some linguists prefer to avoid making the decision. Their terminology includes strong vowel phonemes for stressed vowels plus several weak phonemes for unstressed vowels: thus, represents the weak phoneme, which contrasts with other weak phonemes, but not with strong ones.

Diphthongs

Russian diphthongs all end in a non-syllabic, an allophone of and the only semivowel in Russian. In all contexts other than after a vowel, is considered an approximant consonant. Phonological descriptions of may also classify it as a consonant even in the coda. In such descriptions, Russian has no diphthongs.
The first part of diphthongs is subject to the same allophony as their constituent vowels. Examples of words with diphthongs:, ей, де́йственный ., written or, is a common inflexional affix of adjectives, participles, and nouns, where it is often unstressed; at normal conversational speed, such unstressed endings may be monophthongized to. When stressed, this affix is spelled and pronounced. Unstressed may be pronounced in free variation with. In adjectives ending in, traditional Moscow norm prescribed the pronunciation, but now those adjectives are usually pronounced according to the spelling, thus. The same can be said about verbs ending in.

Consonants

denotes palatalization, meaning the center of the tongue is raised during and after the articulation of the consonant. Phonemes that have at different times been disputed are enclosed in parentheses.
; Notes

Most consonant phonemes come in hard–soft pairs, except for always-hard and always-soft and formerly or marginally. There is a marked tendency of Russian hard consonants to be velarized or uvularized, though this is a subject of some academic dispute. Velarization is clearest before the front vowels and, and with labial and velar consonants as well as the lateral. As with palatalization, it results in vowel colouring and diphthongisation when stressed, in particular with, realized approximately as or. Its function is to make the contrast between hard and soft consonants perceptually more salient, and the less salient the contrast is otherwise, the higher the velarization degree.
* and are always hard in native words. A few loanwords are spelled with or ; authoritative pronunciation dictionaries prescribe hard pronunciation for some of them but soft for other ones ; жюри may be pronounced either way. The letter combinations,,,,, and also occur in foreign proper names, mostly of French or Lithuanian origin. Notable examples include Гёльджюк, Жён Африк, Жюль Верн, Герхард Шюрер, Шяуляй, and Шяшувис. The dictionary of prescribes soft pronunciation in these names. However, since the cases of soft and are marginal and not universally pronounced as such, and are generally considered always-hard consonants, and the long phonemes and are not considered their soft counterparts, as they do not pattern in the same ways that other hard–soft pairs do.
* is generally listed among the always-hard consonants; however, certain foreign proper names, including those of Ukrainian, Polish, Lithuanian, or German origin, as well as loanwords, contain a soft. The phonemicity of a soft is supported by neologisms that come from native word-building processes. However, according to, really is always hard, and realizing it as palatalized is considered "emphatically non-standard", and occurs only in some regional accents.
* and are always soft.
* is also always soft. A formerly common pronunciation of indicates the sound may be two underlying phonemes: and, thus can be considered as a marginal phoneme. In today's most widespread pronunciation, appears for orthographical -зч-/-сч- where ч- starts the root of a word, and -з/-с belongs to a preposition or a "clearly distinguishable" prefix ; in all other cases is used
* The marginally phonemic sound is largely obsolete except in the more conservative standard accent of Moscow, in which it only occurs in a handful of words; insofar as this soft pronunciation is lost, the corresponding hard replaces it: e.g. ~. This sound may derive from an underlying or : заезжа́ть, modern. For most speakers, it can most commonly be formed by assimilative voicing of : . For more information, see alveolo-palatal consonant and retroflex consonant.
and are somewhat concave apical postalveolar. They may be described as retroflex, e.g. by, but this is to indicate that they are not laminal nor palatalized; not to say that they are subapical. They also tend to be at least slightly labialized, including when followed by unrounded vowels.
Hard are laminal denti-alveolar ; unlike in many other languages, does not become velar before velar consonants.
Hard has been variously described as pharyngealized apical alveolar and velarized laminal denti-alveolar.
Hard is postalveolar, typically a trill.
Soft is an apical dental trill, usually with only a single contact.
Soft are laminal alveolar. As of the twenty-first century are affricated in most contexts. This phenonomenon of affrication is known in Russian as tsekan'ye and dzekan'ye, and it is paralleled in Belarusian.
Soft is either laminal alveolar or laminal denti-alveolar.
are dental, i.e. dentalized laminal alveolar. They are pronounced with the blade of the tongue very close to the upper front teeth, with the tip of the tongue resting behind the lower front teeth.
The voiced are often realized with weak friction or even as approximants, particularly in spontaneous speech.
A marginal phoneme occurs instead of in certain interjections:,, угу́, эге, о-го-го́, э-ге-ге, гоп.. The same sound can be found in, optionally in га́битус 'habitus' and in a few other loanwords. Also optionally can be used instead of in certain religious words : Бо́га, Бо́гу..., Госпо́дь 'Lord', благо́й 'good'.
Some linguists postulate the existence of a phonemic glottal stop. This marginal phoneme can be found, for example, in the word не́-а. Claimed minimal pairs for this phoneme include 'narrowed' vs су́женый 'betrothed' and с А́ней 'with Ann' vs Са́ней ' Alex'.

There is some dispute over the phonemicity of soft velar consonants. Typically, the soft–hard distinction is allophonic for velar consonants: they become soft before front vowels unless there is a word boundary, in which case they are hard. Hard variants occur everywhere else. Exceptions are represented mostly by:

Loanwords:
* Soft: гёзы,, гяу́р, секью́рити, кекс, кяри́з, са́нкхья, хянга́;
* Hard: кок-сагы́з, гэ́льский, акы́н, кэб, хэ́ппенинг.
Proper nouns of foreign origin:
* Soft: Алигье́ри, Гёте, Гю́нтер, Гянджа́, Джокьяка́рта, Кёнигсберг, Кюраса́о, Кя́хта, Хью́стон, Хёндэ, Хю́бнер, Пюхяя́рви;
* Hard: Мангышла́к, Гэ́ри, Кызылку́м, Кэмп-Дэ́вид, Архы́з, Хуанхэ́.

The rare native examples are fairly new, as most of them were coined in the last century:Soft: forms of the verb ткать 'weave' ; догёнок/догята, герцогёнок/герцогята; and adverbial participles of the type берегя, стерегя, стригя, жгя, пекя, секя, ткя ;Hard: the name гэ of letter, acronyms and derived words, a few interjections, some onomatopoeic words, and colloquial forms of certain patronyms: Олегыч, Маркыч, Аристархыч.
In the mid-twentieth century, a small number of reductionist approaches made by structuralists put forth that palatalized consonants occur as the result of phonological processes involving, so that there were no underlying palatalized consonants. Despite such proposals, linguists have long agreed that the underlying structure of Russian is closer to that of its acoustic properties, namely that soft consonants are separate phonemes in their own right.

Voicing

Final devoicing

Voiced consonants are devoiced word-finally unless the next word begins with a voiced obstruent. In other words, their voiceless equivalent will be used.
Examples:

sounds like расскас
sounds like нош
sounds like Иваноф ; and so on.

Г also represents voiceless word-finally in some words, such as . This is related to the use of the marginal phoneme in some religious words.

Voicing elsewhere

Generally, when a voiced consonant comes before a voiceless one, its sound will shift to its voiceless equivalent.

Example: sounds like Лошка.

That happens because ж is a voiced consonant, and it comes before the voiceless к.
The same logic applies when a voiceless consonant comes before a voiced one. In this case, the sound of the former will change to its voiced equivalent.

Example: sounds like зделать .

Russian features general regressive assimilation of voicing and palatalization. In longer clusters, this means that multiple consonants may be soft despite their underlyingly being hard. The process of voicing assimilation applies across word-boundaries when there is no pause between words.
Within a morpheme, voicing is not distinctive before obstruents. The voicing or devoicing is determined by that of the final obstruent in the sequence: просьба, водка . In foreign borrowings, this is not always the case for, as in Адольф Гитлер and граф болеет. and are unusual in that they seem transparent to voicing assimilation; in the syllable onset, both voiced and voiceless consonants may appear before :

тварь )
два
световой
звезда

When precedes and follows obstruents, the voicing of the cluster is governed by that of the final segment so that voiceless obstruents that precede are voiced if is followed by a voiced obstruent while a voiceless obstruent will devoice all segments.
,, and have voiced allophones before voiced obstruents, as in дочь бы, плацдарм and горох готов .
Other than and, nasals and liquids devoice between voiceless consonants or a voiceless consonant and a pause: контрфорс ).

Palatalization

Before, paired consonants are normally soft as in пью and бью . However, the last consonant of prefixes and parts of compound words generally remains hard in the standard language: отъезд, Минюст ; when the prefix ends in or there may be an optional softening: съездить .
Paired consonants preceding are also soft; although there are exceptions from loanwords, alternations across morpheme boundaries are the norm. The following examples show some of the morphological alternations between a hard consonant and its soft counterpart:
Velar consonants are soft when preceding, and never occur before within a word.
Before hard dental consonants and, labial and dental consonants are hard: орла́, cf. орёл .

Assimilative palatalization

Paired consonants preceding another consonant often inherit softness from it. This phenomenon in literary language has complicated and evolving rules with many exceptions, depending on what these consonants are, in what morphemic position they meet and to what style of speech the word belongs. In old Moscow pronunciation, softening was more widespread and regular; nowadays some cases that were once normative have become low colloquial or archaic. In fact, consonants can be softened to differing extents, become semi-hard or semi-soft.
The more similar the consonants are, the more they tend to soften each other. Also, some consonants tend to be softened less, such as labials and.
Softening is stronger inside the word root and between root and suffix; it is weaker between prefix and root and weak or absent between a preposition and the word following.

Before soft dental consonants, and often soft labial consonants, dental consonants are soft.
is assimilated to the palatalization of the following velar consonant: лёгких ).
Palatalization assimilation of labial consonants before labial consonants is in free variation with nonassimilation, such that бомбить is either or depending on the individual speaker.
When hard precedes its soft equivalent, it is also soft and likely to form a single long sound. This is slightly less common across affix boundaries.

In addition to this, dental fricatives conform to the place of articulation . In careful speech, this does not occur across word boundaries.
Russian has the rare feature of nasals not typically being assimilated in place of articulation. Both and appear before retroflex consonants: деньжонки ) and ханжой ). In the same context, other coronal consonants are always hard.
Assimilative palatalization may sometimes also occur across word boundaries as in других гимназий, but such pronunciation is uncommon and characteristic of uncareful speech.

Consonant clusters

As a Slavic language, Russian has fewer phonotactic restrictions on consonants than many other languages, allowing for clusters that would be difficult for English speakers; this is especially so at the beginning of a syllable, where Russian speakers make no sonority distinctions between fricatives and stops. These reduced restrictions begin at the morphological level; outside of two morphemes that contain clusters of four consonants: встрет-/встреч- 'meet', and чёрств-/черств- 'stale', native Russian morphemes have a maximum consonant cluster size of three:

	Russian	IPA/Audio	Translation
CCL	скрыва́ть		'to hide'
CCN	мгнове́ние		' instant'
CCC*	ствол		'tree trunk'
LCL	верблю́д		'camel'
LCC	то́лстый		'thick'

For speakers who pronounce instead of, words like общий also constitute clusters of this type.

	Russian	IPA/Audio	Translation
CC	кость		'bone'
LC	смерть		'death'
CL	слепо́й		'blind'
LL	го́рло		'throat'
CJ	статья́		'article'
LJ	рья́ный		'zealous'

If is considered a consonant in the coda position, then words like айва́ contain semivowel+consonant clusters.
Affixation also creates consonant clusters. Some prefixes, the best known being вз-/вс-, produce long word-initial clusters when they attach to a morpheme beginning with consonant. However, the four-consonant limitation persists in the syllable onset.
Clusters of three or more consonants are frequently simplified, usually through syncope of one of them, especially in casual pronunciation.
All word-initial four-consonant clusters begin with or, followed by a stop, and a liquid:

Russian	IPA/Audio	Translation
взбрело		' took it '
взгляд		'gaze'
взгромоздиться		'to perch'
вздрогнуть		'to flinch'
всклокоченный		'disheveled'
вскрыть		'to unseal'
всплеск		'splash'
вспрыгнуть		'to jump up'
встлеть		'to begin to smolder'
встречать		'to meet'
всхлип		'whimper'
всхрапывать		'to snort'

Because prepositions in Russian act like clitics, the syntactic phrase composed of a preposition and a following word constitutes a phonological word that acts like a single grammatical word. This can create a 4-consonant onset cluster not starting in or ; for example, the phrase в мгнове́ние is pronounced .
In the syllable coda, suffixes that contain no vowels may increase the final consonant cluster of a syllable, theoretically up to seven consonants: *мо́нстрств . There is usually an audible release of plosives between these consecutive consonants at word boundaries, the major exception being clusters of homorganic consonants.
Consonant cluster simplification in Russian includes degemination, syncope, dissimilation, and weak vowel insertion. For example, is pronounced, as in расще́лина. There are also a few isolated patterns of apparent cluster reduction arguably the result of historical simplifications. For example, dental stops are dropped between a dental continuant and a dental nasal or lateral: ле́стный 'flattering'. Other examples include:

>	чу́вство	'feeling'
>	со́лнце	'sun'
>	се́рдце	'heart'
>	сердчи́шко	'heart'
>	шотла́ндский	'Scottish'
>	маркси́стский	'Marxist'

Compare: со́лнечный 'solar, sunny', серде́чный 'heart, cordial', Шотла́ндия 'Scotland', маркси́ст 'Marxist'.
The simplifications of consonant clusters are done selectively; bookish-style words and proper nouns are typically pronounced with all consonants even if they fit the pattern. For example, the word голла́ндка is pronounced in a simplified manner for the meaning of 'Dutch oven' and in a full form for 'Dutch woman'. The orthographic combination is pronounced in the words здра́вствуй 'hello', чу́вство 'feeling', безмо́лвствовать 'to be silent', and related words, otherwise pronounced : баловство́ 'naughtiness'.
In certain cases, this syncope produces homophones, e.g. ко́стный and ко́сный, both are pronounced.
Another method of dealing with consonant clusters is inserting an epenthetic vowel, after most prepositions and prefixes that normally end in a hard consonant. This includes both historically motivated usage and cases of its modern extrapolations. There are no strict limits when the epenthetic is obligatory, optional, or prohibited. One of the most typical cases of the epenthetic is between a morpheme-final hard consonant and a cluster starting with the same or similar consonant. E.g. со среды́ 'from Wednesday' ||+|| →, not *с среды; ототру́ 'I'll scrub' ||+|| →, not *оттру. The interfix is also used in compound words: пищево́д 'oesophagus' ||+|| →.

Stress

Stress in Russian is phonemic and therefore unpredictable. It may fall on any syllable, and can vary drastically in similar or related words. For example, in the following table, in the numbers 50 and 60, the stress moves to the last syllable, despite having a structure similar to, say, 70 and 80:

Word	No.
де́сять	10
два́дцать	20
три́дцать	30
со́рок	40
пятьдеся́т	50
шестьдеся́т	60
се́мьдесят	70
во́семьдесят	80
девяно́сто	90

Words can also contrast based just on stress. Stress shifts can even occur within an inflexional paradigm: до́ма vs дома́ . The place of the stress in a word is determined by the interplay between the morphemes it contains, as morphemes may be obligatorily stressed, obligatorily unstressed, or variably stressed.
Generally, only one syllable in a word is stressed; this rule, however, does not extend to most compound words, such as моро́зоусто́йчивый, which have multiple stresses, with the last of them being primary.
Phonologically, stressed syllables are mostly realised not only by the lack of aforementioned vowel reduction, but also by a somewhat longer duration than unstressed syllables. More intense pronunciation is also a relevant cue, although this quality may merge with prosodical intensity. Pitch accent has only a minimal role in indicating stress, mostly due to its prosodical importance, which may prove a difficulty for Russians identifying stressed syllables in more pitched languages.
A stress defines a phonological concept of phonetic word — a sequence of morphemes clustered around one nuclear stress. A phonetic word may contain multiple lexical items.

Supplementary notes

There are numerous ways in which Russian spelling does not match pronunciation. The historical transformation of into in genitive case endings and the word for 'him' is not reflected in the modern Russian orthography: the pronoun его 'his/him', and the adjectival declension suffixes -ого and -его. Orthographic г represents in a handful of word roots: легк-/лёгк-/легч- 'easy' and мягк-/мягч- 'soft'. There are a handful of words in which consonants which have long since ceased to be pronounced even in careful pronunciation are still spelled, e.g., the 'l' in солнце .
The phoneme is often realized as before stressed vowels, especially in emphatic speech. Between any vowel and, may be dropped: мои, аист, делает . Unstressed sequences and after vowels may be realized as, : большая, знаю .
velarizes hard consonants: ты . and velarize and labialize hard consonants and labialize soft consonants: бок, нёс . is a diphthong or even a triphthong, with a closer lip rounding at the beginning of the vowel that gets progressively weaker, particularly when occurring word-initially or word-finally under stress.
A weak palatal offglide may occur between certain soft consonants and back vowels.