gun vs muzzle

gun and muzzle both are nouns.

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

gun (noun)	muzzle (noun)
the discharge of a firearm as signal or as a salute in military ceremonies	forward projecting part of the head of certain animals; includes the jaws and nose
a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)	restraint put into a person's mouth to prevent speaking or shouting
large but transportable armament	the open circular discharging end of a gun
a hand-operated pump that resembles a pistol; forces grease into parts of a machine	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
a pedal that controls the throttle valve
a professional killer who uses a gun
a person who shoots a gun (as regards their ability)

gun (verb)	muzzle (verb)
shoot with a gun	tie a gag around someone's mouth in order to silence them
	prevent from speaking out
	fit with a muzzle