whipsnake

or whip snake

[ hwip-sneyk, wip- ]
/ ˈʰwɪpˌsneɪk, ˈwɪp- /

noun

any of several long, slender New World snakes of the genus Masticophis, the tail of which resembles a whip.
any of various similar or related snakes.

Origin of whipsnake

First recorded in 1765–75; whip + snake

British Dictionary definitions for whip snake

whip snake

noun

any of several long slender fast-moving nonvenomous snakes of the colubrid genus Coluber, such as C. hippocrepis (horseshoe whipsnake) of Eurasia
any of various other slender nonvenomous snakes, such as Masticophis flagellum (coachwhip snake) of the US