hoop snake vs colubrid snake

hoop snake and colubrid snake both are nouns.

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

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

hoop snake: any of various harmless North American snakes that were formerly believed to take tail in mouth and roll along like a hoop
colubrid snake: mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes

Other hypernyms of hoop snake include colubrid.

hoop snake (noun)	colubrid snake (noun)
any of various harmless North American snakes that were formerly believed to take tail in mouth and roll along like a hoop	mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes