gun vs auto

gun and auto both are nouns.

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

gun (noun)	auto (noun)
the discharge of a firearm as signal or as a salute in military ceremonies	a motor vehicle with four wheels; usually propelled by an internal combustion engine
a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
large but transportable armament
a hand-operated pump that resembles a pistol; forces grease into parts of a machine
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)	auto (verb)
shoot with a gun