accelerator vs gas pedal

accelerator and gas pedal both are nouns.

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

As nouns, accelerator and gas pedal are synonyms defined as:

Other synonyms of accelerator include accelerator pedal, gas, gun, throttle.

accelerator (noun)	gas pedal (noun)
a valve that regulates the supply of fuel to the engine	a pedal that controls the throttle valve
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