accelerator pedal vs accelerator

accelerator pedal and accelerator both are nouns.

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

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

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

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

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