breathing spell vs breather

breathing spell and breather both are nouns.

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

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

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

breathing spell (noun)	breather (noun)
a short respite	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