accelerator pedal vs motorcar

accelerator pedal and motorcar both are nouns.

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

accelerator pedal (noun)	motorcar (noun)
a pedal that controls the throttle valve	a motor vehicle with four wheels; usually propelled by an internal combustion engine