accelerator vs pedal

accelerator and pedal both are nouns.

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

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

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

accelerator (noun)	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 sustained bass note
a pedal that controls the throttle valve
(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

accelerator (adjective)	pedal (adjective)
	of or relating to the feet

accelerator (verb)	pedal (verb)
	operate the pedals on a keyboard instrument
	ride a bicycle