swollen vs puffy

swollen and puffy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
swollen	No	Yes	No	No
puffy	No	Yes	No	No

As adjectives, swollen and puffy are synonyms defined as:

Other synonyms of swollen include bloated, distended, intumescent, tumescent, tumid, turgid.

swollen (adjective)	puffy (adjective)
characteristic of false pride; having an exaggerated sense of self-importance	being puffed out; used of hair style or clothing
abnormally distended especially by fluids or gas	blowing in puffs or short intermittent blasts
	abnormally distended especially by fluids or gas