swelling vs puffiness

swelling and puffiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
swelling	Yes	No	No	No
puffiness	Yes	No	No	No

As nouns, swelling and puffiness are synonyms defined as:

swelling and puffiness: an abnormal protuberance or localized enlargement

Other synonyms of swelling include lump.

swelling (noun)	puffiness (noun)
the increase in volume of certain substances when they are heated (often accompanied by release of water)	lack of elegance as a consequence of being pompous and puffed up with vanity
something that bulges out or is protuberant or projects from its surroundings	an abnormal protuberance or localized enlargement
an abnormal protuberance or localized enlargement