breathing vs breathing out

breathing and breathing out both are nouns.

Word	Noun	Adjective	Verb	Adverb
breathing	Yes	Yes	No	No
breathing out	Yes	No	No	No

breathing (noun)	breathing out (noun)
the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation	the act of expelling air from the lungs

breathing (adjective)	breathing out (adjective)
passing or able to pass air in and out of the lungs normally; sometimes used in combination