building vs exterior door

building and exterior door both are nouns.

Word	Noun	Adjective	Verb	Adverb
building	Yes	No	No	No
exterior door	Yes	No	No	No

building (noun)	exterior door (noun)
the act of constructing something	a doorway that allows entrance to or exit from a building
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