building vs room

building and room both are nouns.

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

building (noun)	room (noun)
the act of constructing something	an area within a building enclosed by walls and floor and ceiling
the commercial activity involved in repairing old structures or constructing new ones	the people who are present in a room
a structure that has a roof and walls and stands more or less permanently in one place	space for movement
the occupants of a building	opportunity for

building (verb)	room (verb)
	live and take one's meals at or in