unharness vs harness

unharness is not a noun while harness is a noun.

Word	Noun	Adjective	Verb	Adverb
unharness	No	No	Yes	No
harness	Yes	No	Yes	No

unharness (noun)	harness (noun)
	stable gear consisting of an arrangement of leather straps fitted to a draft animal so that it can be attached to and pull a cart
	a support consisting of an arrangement of straps for holding something to the body (especially one supporting a person suspended from a parachute)

unharness (verb)	harness (verb)
remove the harness from	keep in check
	exploit the power of
	put a harness
	control and direct with or as if by reins