barrel vs gun

barrel and gun both are nouns.

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

barrel (noun)	gun (noun)
a cylindrical container that holds liquids	the discharge of a firearm as signal or as a salute in military ceremonies
a tube through which a bullet travels when a gun is fired	a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
any of various units of capacity	large but transportable armament
the quantity that a barrel (of any size) will hold	a hand-operated pump that resembles a pistol; forces grease into parts of a machine
a bulging cylindrical shape; hollow with flat ends	a pedal that controls the throttle valve
	a professional killer who uses a gun
	a person who shoots a gun (as regards their ability)

barrel (verb)	gun (verb)
put in barrels	shoot with a gun