building vs heating plant

building and heating plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
building	Yes	No	No	No
heating plant	Yes	No	No	No

building (noun)	heating plant (noun)
the act of constructing something	utility to warm 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