lash vs unlash

lash is a noun but unlash is not a noun.

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

lash (noun)	unlash (noun)
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

lash (verb)	unlash (verb)
strike as if by whipping	untie the lashing of
beat severely with a whip or rod
bind with a rope, chain, or cord
lash or flick about sharply