breathing space vs breathing room

breathing space and breathing room both are nouns.

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

As nouns, breathing space and breathing room are synonyms defined as:

breathing space and breathing room: sufficient room for easy breathing or movement

breathing space (noun)	breathing room (noun)
sufficient room for easy breathing or movement	sufficient room for easy breathing or movement
a short respite