breathing vs inhalation

breathing and inhalation both are nouns.

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

breathing (noun)	inhalation (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 inhaling; the drawing in of air (or other gases) as in breathing
	a medication to be taken by inhaling it

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