foot pedal vs gun

foot pedal and gun both are nouns.

Word	Noun	Adjective	Verb	Adverb
foot pedal	Yes	No	No	No
gun	Yes	No	Yes	No

As nouns, gun is a hyponym of foot pedal; that is, gun is a word with a more specific, narrower meaning than foot pedal:

foot pedal (noun)	gun (noun)
a lever that is operated with the foot	the discharge of a firearm as signal or as a salute in military ceremonies
	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)

foot pedal (verb)	gun (verb)
	shoot with a gun