unmuzzle vs muzzle

unmuzzle is not a noun while muzzle is a noun.

Word	Noun	Adjective	Verb	Adverb
unmuzzle	No	No	Yes	No
muzzle	Yes	No	Yes	No

unmuzzle (noun)	muzzle (noun)
	forward projecting part of the head of certain animals; includes the jaws and nose
	restraint put into a person's mouth to prevent speaking or shouting
	the open circular discharging end of a gun
	a leather or wire restraint that fits over an animal's snout (especially a dog's nose and jaws) and prevents it from eating or biting

unmuzzle (verb)	muzzle (verb)
remove the muzzle from (a dog)	tie a gag around someone's mouth in order to silence them
	prevent from speaking out
	fit with a muzzle