roofing vs building

roofing and building both are nouns.

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

roofing (noun)	building (noun)
the craft of a roofer	the act of constructing something
material used to construct a roof	the commercial activity involved in repairing old structures or constructing new ones
	a structure that has a roof and walls and stands more or less permanently in one place
	the occupants of a building