flattery vs puffery

flattery and puffery both are nouns.

Word	Noun	Adjective	Verb	Adverb
flattery	Yes	No	No	No
puffery	Yes	No	No	No

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

flattery: excessive or insincere praise
puffery: a flattering commendation (especially when used for promotional purposes)

Other hyponyms of flattery include adulation, blandishment, cajolery, palaver, blarney, coaxing, soft soap, sweet talk.

flattery (noun)	puffery (noun)
excessive or insincere praise	a flattering commendation (especially when used for promotional purposes)