cobra vs elapid snake

cobra and elapid snake both are nouns.

Word	Noun	Adjective	Verb	Adverb
cobra	Yes	No	No	No
elapid snake	Yes	No	No	No

As nouns, elapid snake is a hypernym of cobra; that is, elapid snake is a word with a broader meaning than cobra:

cobra: venomous Asiatic and African elapid snakes that can expand the skin of the neck into a hood
elapid snake: any of numerous venomous fanged snakes of warmer parts of both hemispheres

Other hypernyms of cobra include elapid.

cobra (noun)	elapid snake (noun)
venomous Asiatic and African elapid snakes that can expand the skin of the neck into a hood	any of numerous venomous fanged snakes of warmer parts of both hemispheres