indigo snake vs colubrid snake

indigo snake and colubrid snake both are nouns.

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

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

indigo snake: large dark-blue nonvenomous snake that invades burrows; found in southern North America and Mexico
colubrid snake: mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes

Other hypernyms of indigo snake include colubrid.

indigo snake (noun)	colubrid snake (noun)
large dark-blue nonvenomous snake that invades burrows; found in southern North America and Mexico	mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes