breather vs breathing space

breather and breathing space both are nouns.

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

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

Other synonyms of breather include breath, breathing place, breathing spell, breathing time.

breather (noun)	breathing space (noun)
air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time	sufficient room for easy breathing or movement
a short respite	a short respite