elapid snake vs ophidian

elapid snake and ophidian both are nouns.

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

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

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

Other hypernyms of elapid snake include serpent, snake.

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