breathing space vs breathing spell

breathing space and breathing spell both are nouns.

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

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

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

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