racer vs colubrid

racer and colubrid both are nouns.

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

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

racer: slender fast-moving North American snakes
colubrid: mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes

Other hypernyms of racer include colubrid snake.

racer (noun)	colubrid (noun)
an animal that races	mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes
slender fast-moving North American snakes
a fast car that competes in races
someone who drives racing cars at high speeds