intake vs breathing in

intake and breathing in both are nouns.

Word	Noun	Adjective	Verb	Adverb
intake	Yes	No	No	No
breathing in	Yes	No	No	No

As nouns, intake and breathing in are synonyms defined as:

intake and breathing in: the act of inhaling; the drawing in of air (or other gases) as in breathing

Other synonyms of intake include aspiration, inhalation, inspiration.

intake (noun)	breathing in (noun)
the process of taking food into the body through the mouth (as by eating)	the act of inhaling; the drawing in of air (or other gases) as in breathing
the act of inhaling; the drawing in of air (or other gases) as in breathing
an opening through which fluid is admitted to a tube or container