roof vs auto

roof and auto both are nouns.

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

roof (noun)	auto (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
an upper limit on what is allowed
the inner top surface of a covered area or hollow space

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