roof vs car

roof and car both are nouns.

Word	Noun	Adjective	Verb	Adverb
roof	Yes	No	Yes	No
car	Yes	No	No	No

roof (noun)	car (noun)
a protective covering that covers or forms the top of a building	a motor vehicle with four wheels; usually propelled by an internal combustion engine
protective covering on top of a motor vehicle	a wheeled vehicle adapted to the rails of railroad
an upper limit on what is allowed	where passengers ride up and down
the inner top surface of a covered area or hollow space	the compartment that is suspended from an airship and that carries personnel and the cargo and the power plant
	a conveyance for passengers or freight on a cable railway

roof (verb)	car (verb)
provide a building with a roof; cover a building with a roof