garter snake vs colubrid snake

garter snake and colubrid snake both are nouns.

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

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

garter snake: any of numerous nonvenomous longitudinally-striped viviparous North American and Central American snakes
colubrid snake: mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes

Other hypernyms of garter snake include colubrid.

garter snake (noun)	colubrid snake (noun)
any of numerous nonvenomous longitudinally-striped viviparous North American and Central American snakes	mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes