building vs heating

building and heating both are nouns.

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

building (noun)	heating (noun)
the act of constructing something	utility to warm a building
the commercial activity involved in repairing old structures or constructing new ones	the process of becoming warmer; a rising temperature
a structure that has a roof and walls and stands more or less permanently in one place
the occupants of a building