Cobra

Cobra is the common name of various venomous snakes, most of which belong to the genus Naja.
Many cobras are capable of rearing upwards and producing a hood when threatened.

Other snakes known as "cobras"

While the members of the genus Naja constitute the true cobras, the name cobra is also applied to these other genera and species:

The rinkhals, ringhals or ring-necked spitting cobra so-called for its neck band as well as its habit of rearing upwards and producing a hood when threatened
The king cobra or hamadryad
The two species of tree cobras, Goldie's tree cobra and the black tree cobra
The two species of shield-nosed cobras, the Cape coral snake and the shield-nosed cobra
The two species of black desert cobras or desert black snakes, Walterinnesia aegyptia and Walterinnesia morgani, neither of which rears upwards and produces a hood when threatened
The eastern coral snake or American cobra, which also does not rear upwards and produce a hood when threatened

The false water cobra is the only "cobra" species that is not a member of the Elapidae. It does not rear upwards, produces only a slight flattening of the neck when threatened, and is only mildly venomous.