room vs elbow room

room and elbow room both are nouns.

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

As nouns, room and elbow room are synonyms defined as:

Other synonyms of room include way.

room (noun)	elbow room (noun)
an area within a building enclosed by walls and floor and ceiling	space for movement
the people who are present in a room
space for movement
opportunity for

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