coachwhip vs whip-snake

coachwhip and whip-snake both are nouns.

Word	Noun	Adjective	Verb	Adverb
coachwhip	Yes	No	No	No
whip-snake	Yes	No	No	No

As nouns, whip-snake is a hypernym of coachwhip; that is, whip-snake is a word with a broader meaning than coachwhip:

coachwhip: a whipsnake of southern United States and Mexico; tail resembles a braided whip
whip-snake: any of several small fast-moving snakes with long whiplike tails

Other hypernyms of coachwhip include whip snake, whipsnake.

coachwhip (noun)	whip-snake (noun)
a whipsnake of southern United States and Mexico; tail resembles a braided whip	any of several small fast-moving snakes with long whiplike tails
desert shrub of southwestern United States and Mexico having slender naked spiny branches that after the rainy season put forth foliage and clusters of red flowers