exhalation vs puffing

exhalation and puffing both are nouns.

Word	Noun	Adjective	Verb	Adverb
exhalation	Yes	No	No	No
puffing	Yes	No	No	No

As nouns, puffing is a hyponym of exhalation; that is, puffing is a word with a more specific, narrower meaning than exhalation:

Other hyponyms of exhalation include huffing, snorting, blow, puff, wind.

exhalation (noun)	puffing (noun)
the act of expelling air from the lungs	an act of forcible exhalation
exhaled breath	blowing tobacco smoke out into the air