accelerator vs foot lever

accelerator and foot lever both are nouns.

Word	Noun	Adjective	Verb	Adverb
accelerator	Yes	No	No	No
foot lever	Yes	No	No	No

As nouns, foot lever is a hypernym of accelerator; that is, foot lever is a word with a broader meaning than accelerator:

Other hypernyms of accelerator include foot pedal, pedal, treadle.

accelerator (noun)	foot lever (noun)
a valve that regulates the supply of fuel to the engine	a lever that is operated with the foot
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