rec room vs canteen

rec room and canteen both are nouns.

Word	Noun	Adjective	Verb	Adverb
rec room	Yes	No	No	No
canteen	Yes	No	No	No

As nouns, canteen is a hyponym of rec room; that is, canteen is a word with a more specific, narrower meaning than rec room:

Other hyponyms of rec room include family room, game room, playroom, rumpus room.

rec room (noun)	canteen (noun)
a room equipped for informal entertaining	a flask for carrying water; used by soldiers or travelers
	restaurant in a factory; where workers can eat
	a recreation room in an institution
	a restaurant outside; often for soldiers or policemen
	sells food and personal items to personnel at an institution or school or camp etc.