elapid vs serpent

elapid and serpent both are nouns.

Word	Noun	Adjective	Verb	Adverb
elapid	Yes	No	No	No
serpent	Yes	No	No	No

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

elapid: any of numerous venomous fanged snakes of warmer parts of both hemispheres
serpent: limbless scaly elongate reptile; some are venomous

Other hypernyms of elapid include ophidian, snake.

elapid (noun)	serpent (noun)
any of numerous venomous fanged snakes of warmer parts of both hemispheres	limbless scaly elongate reptile; some are venomous
	an obsolete bass cornet; resembles a snake
	a firework that moves in serpentine manner when ignited