accelerator vs foot pedal

accelerator and foot pedal both are nouns.

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

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

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

accelerator (noun)	foot pedal (noun)
a valve that regulates the supply of fuel to the engine	a lever that is operated with the foot
a scientific instrument that increases the kinetic energy of charged particles
a pedal that controls the throttle valve
(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected