king snake vs colubrid snake

king snake and colubrid snake both are nouns.

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

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

king snake: any of numerous nonvenomous North American constrictors; feed on other snakes and small mammals
colubrid snake: mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes

Other hypernyms of king snake include colubrid.

king snake (noun)	colubrid snake (noun)
any of numerous nonvenomous North American constrictors; feed on other snakes and small mammals	mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes