shoot vs gun

shoot and gun both are nouns.

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

As verbs, gun is a hyponym of shoot; that is, gun is a word with a more specific, narrower meaning than shoot:

Other hyponyms of shoot include blaze, blaze away, overshoot, sharpshoot, snipe, fire, open fire, pump.

shoot (noun)	gun (noun)
the act of shooting at targets	the discharge of a firearm as signal or as a salute in military ceremonies
a new branch	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)

shoot (verb)	gun (verb)
give an injection to	shoot with a gun
produce buds, branches, or germinate
measure the altitude of by using a sextant
record on photographic film
make a film or photograph of something
utter fast and forcefully
fire a shot; release
hit with a missile from a weapon
score
spend frivolously and unwisely
force or drive (a fluid or gas) into by piercing
throw or propel in a specific direction or towards a specific objective
throw dice, as in a crap game
variegate by interweaving weft threads of different colors
run or move very quickly or hastily
move quickly and violently
send forth suddenly, intensely, swiftly
cause a sharp and sudden pain in
kill by firing a missile
emit (as light, flame, or fumes) suddenly and forcefully