accelerator vs accelerator pedal

accelerator and accelerator pedal both are nouns.

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

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

accelerator and accelerator pedal: a pedal that controls the throttle valve

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

accelerator (noun)	accelerator 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