expiration vs puffing

expiration and puffing both are nouns.

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

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

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

expiration (noun)	puffing (noun)
the act of expelling air from the lungs	an act of forcible exhalation
euphemistic expressions for death	blowing tobacco smoke out into the air
a coming to an end of a contract period