flatus vs breaking wind

flatus and breaking wind both are nouns.

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

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

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

Other synonyms of flatus include fart, farting, wind.

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