room vs seating room

room and seating room both are nouns.

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

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

room (noun)	seating room (noun)
an area within a building enclosed by walls and floor and ceiling	an area that includes places where several people can sit
the people who are present in a room
space for movement
opportunity for

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