intumescency vs puffiness

intumescency and puffiness both are nouns.

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

As nouns, puffiness is a hypernym of intumescency; that is, puffiness is a word with a broader meaning than intumescency:

Other hypernyms of intumescency include lump, swelling.

intumescency (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
swelling up with blood or other fluids (as with congestion)	an abnormal protuberance or localized enlargement