breaking wind vs flatus

breaking wind and flatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
breaking wind	Yes	No	No	No
flatus	Yes	No	No	No

As nouns, breaking wind and flatus are synonyms defined as:

breaking wind and flatus: a reflex that expels intestinal gas through the anus

Other synonyms of breaking wind include fart, farting, wind.

breaking wind (noun)	flatus (noun)
a reflex that expels intestinal gas through the anus	a reflex that expels intestinal gas through the anus