trigger vs gun

trigger and gun both are nouns.

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

trigger (noun)	gun (noun)
an act that sets in motion some course of events	the discharge of a firearm as signal or as a salute in military ceremonies
lever that activates the firing mechanism of a gun	a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
a device that activates or releases or causes something to happen	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)

trigger (verb)	gun (verb)
release or pull the trigger on	shoot with a gun
put in motion or move to act