elbow room vs room

elbow room and room both are nouns.

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

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

Other synonyms of elbow room include way.

elbow room (noun)	room (noun)
space for movement	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

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