breathing room vs room

breathing room and room both are nouns.

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

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

Other hypernyms of breathing room include elbow room, way.

breathing room (noun)	room (noun)
sufficient room for easy breathing or 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

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