roofing vs roof

roofing and roof both are nouns.

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

roofing (noun)	roof (noun)
the craft of a roofer	a protective covering that covers or forms the top of a building
material used to construct a roof	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

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