gas pedal vs accelerator

gas pedal and accelerator both are nouns.

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

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

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

gas 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