Houses of Parliament vs building

Houses of Parliament and building both are nouns.

Word	Noun	Adjective	Verb	Adverb
Houses of Parliament	Yes	No	No	No
building	Yes	No	No	No

Houses of Parliament (noun)	building (noun)
the building in which the House of Commons and the House of Lords meet	the act of constructing something
	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