inhalation vs breath

inhalation and breath both are nouns.

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

As nouns, breath is a hypernym of inhalation; that is, breath is a word with a broader meaning than inhalation:

inhalation: the act of inhaling; the drawing in of air (or other gases) as in breathing
breath: the process of taking in and expelling air during breathing

inhalation (noun)	breath (noun)
the act of inhaling; the drawing in of air (or other gases) as in breathing	the process of taking in and expelling air during breathing
a medication to be taken by inhaling it	an indirect suggestion
	a slight movement of the air
	the air that is inhaled and exhaled in respiration
	a short respite