living room vs room

living room and room both are nouns.

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

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

living room: a room in a private house or establishment where people can sit and talk and relax
room: an area within a building enclosed by walls and floor and ceiling

living room (noun)	room (noun)
a room in a private house or establishment where people can sit and talk and relax	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

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