Paronym

Paronyms are near-homophones, near-homographs and/or near-cognates — words that are similar but not identical in pronunciation, spelling, and/or lexical meaning — which may cause confusion in their understanding and usage. Paronymy is the relationship between a pair of words or phrases which are similar or partially identical in spelling, pronunciation and/or meaning.
In the discussion of semantic analysis, the term paronym can also be used in a narrower sense to refer to words that are derived from the same root, i.e. cognate words.

Examples of English paronyms include:accept and exceptaffect and effectalternately and alternativelyaltitude and attitudeartful and artisticartist and artisanauthoritative and authoritarianbarely and barleybillion and bullionbreath and breadthcapable and culpablechildish and childlikecognitive and cognizantcollision and collusioncommand and commendconfident and confidantconjuncture and conjectureconservationism and conservatismcontinuous and contiguouscontroller and comptrollercoral and corralcountry and countydeath and dearthdefiant and deviantdeprecate and depreciatedesperate and disparatedetergent and deterrentdeviant and deviousdiscord and discourseeclipse and ellipseexception and exemptionexcise and exerciseexpress and espressoextent and extantfitness and finesseflail and failflaunt and floutgauge and gougegraceful and gracioushaven and heavenhistorical and hystericalinfection and inflectioninfluence and affluenceinnocent and innocuousinspiration and aspirationlightning and lighteninglovely and lovablemassage and messagemotive and motifparonym and patronymplague and plaquepopular and populouspresent and presencepresident and precedentproceed and precedeprolepsis and proslepsisquiet and quiterecurring and re-occurringright and ritesensitive and sensiblesentiment and sedimentsucceed and secedestupid and stuportelegraph and telegramtemple and templarterrible and terrifictrifle and truffleupmost and utmostwilling and willfulwreck and ''wreak''