muzzle vs unmuzzle

muzzle is a noun but unmuzzle is not a noun.

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

muzzle (noun)	unmuzzle (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

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