breathing space vs breather

breathing space and breather both are nouns.

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

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

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

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