serpent vs colubrid

serpent and colubrid both are nouns.

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

As nouns, colubrid is a hyponym of serpent; that is, colubrid is a word with a more specific, narrower meaning than serpent:

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

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