furnace room vs room

furnace room and room both are nouns.

Word	Noun	Adjective	Verb	Adverb
furnace room	Yes	No	No	No
room	Yes	No	Yes	No

As nouns, room is a hypernym of furnace room; that is, room is a word with a broader meaning than furnace room:

furnace room: a room (usually in the basement of a building) that contains a furnace for heating the building
room: an area within a building enclosed by walls and floor and ceiling

furnace room (noun)	room (noun)
a room (usually in the basement of a building) that contains a furnace for heating the building	an area within a building enclosed by walls and floor and ceiling
	the people who are present in a room
	space for movement
	opportunity for

furnace room (verb)	room (verb)
	live and take one's meals at or in