government building vs White House

government building and White House both are nouns.

Word	Noun	Adjective	Verb	Adverb
government building	Yes	No	No	No
White House	Yes	No	No	No

government building (noun)	White House (noun)
a building that houses a branch of government	the government building that serves as the residence and office of the President of the United States
	the chief executive department of the United States government