colubrid vs serpent

colubrid and serpent both are nouns.

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

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

colubrid: mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes
serpent: limbless scaly elongate reptile; some are venomous

Other hypernyms of colubrid include ophidian, snake.

colubrid (noun)	serpent (noun)
mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes	limbless scaly elongate reptile; some are venomous
	an obsolete bass cornet; resembles a snake
	a firework that moves in serpentine manner when ignited