elapid vs ophidian

elapid and ophidian both are nouns.

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

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

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

Other hypernyms of elapid include serpent, snake.

elapid (noun)	ophidian (noun)
any of numerous venomous fanged snakes of warmer parts of both hemispheres	limbless scaly elongate reptile; some are venomous