muzzle vs gun muzzle

muzzle and gun muzzle both are nouns.

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

As nouns, muzzle and gun muzzle are synonyms defined as:

muzzle (noun)	gun muzzle (noun)
forward projecting part of the head of certain animals; includes the jaws and nose	the open circular discharging end of a gun
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)	gun muzzle (verb)
tie a gag around someone's mouth in order to silence them
prevent from speaking out
fit with a muzzle