snake vs colubrid snake

snake and colubrid snake both are nouns.

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

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

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

Other hyponyms of snake include colubrid, blind snake, worm snake, constrictor, elapid, elapid snake, sea snake, viper.

snake (noun)	colubrid snake (noun)
limbless scaly elongate reptile; some are venomous	mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes
something long, thin, and flexible that resembles a snake
a long flexible steel coil for dislodging stoppages in curved pipes
a deceitful or treacherous person

snake (verb)	colubrid snake (verb)
move along a winding path
move smoothly and sinuously, like a snake
form a snake-like pattern