auto vs accelerator

auto and accelerator both are nouns.

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

auto (noun)	accelerator (noun)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	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