indigo snake vs colubrid

indigo snake and colubrid both are nouns.

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

As nouns, colubrid is a hypernym of indigo snake; that is, colubrid 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: mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes

Other hypernyms of indigo snake include colubrid snake.

indigo snake (noun)	colubrid (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