horsewhip vs lash

horsewhip and lash both are nouns.

Word	Noun	Adjective	Verb	Adverb
horsewhip	Yes	No	Yes	No
lash	Yes	No	Yes	No

As verbs, lash is a hypernym of horsewhip; that is, lash is a word with a broader meaning than horsewhip:

Other hypernyms of horsewhip include flog, lather, slash, strap, trounce, welt, whip.

horsewhip (noun)	lash (noun)
a whip for controlling horses	a quick blow delivered with a whip or whiplike object
	leather strip that forms the flexible part of a whip
	any of the short curved hairs that grow from the edges of the eyelids

horsewhip (verb)	lash (verb)
whip with a whip intended for horses	strike as if by whipping
	beat severely with a whip or rod
	bind with a rope, chain, or cord
	lash or flick about sharply