gun vs foot pedal

gun and foot pedal both are nouns.

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

As nouns, foot pedal is a hypernym of gun; that is, foot pedal is a word with a broader meaning than gun:

Other hypernyms of gun include foot lever, pedal, treadle.

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