backroom vs installation

backroom and installation both are nouns.

Word	Noun	Adjective	Verb	Adverb
backroom	Yes	No	No	No
installation	Yes	No	No	No

As nouns, installation is a hypernym of backroom; that is, installation is a word with a broader meaning than backroom:

backroom: the meeting place of a group of leaders who make their decisions via private negotiations
installation: a building or place that provides a particular service or is used for a particular industry

Other hypernyms of backroom include facility.

backroom (noun)	installation (noun)
the meeting place of a group of leaders who make their decisions via private negotiations	the act of installing something (as equipment)
	a building or place that provides a particular service or is used for a particular industry
	a formal entry into an organization or position or office