room vs breathing space

room and breathing space both are nouns.

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

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

room (noun)	breathing space (noun)
an area within a building enclosed by walls and floor and ceiling	sufficient room for easy breathing or movement
the people who are present in a room	a short respite
space for movement
opportunity for

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