intumescence vs swelling

intumescence and swelling both are nouns.

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

As nouns, intumescence and swelling are synonyms defined as:

intumescence and swelling: the increase in volume of certain substances when they are heated (often accompanied by release of water)

Other synonyms of intumescence include intumescency.

As nouns, swelling is a hypernym of intumescence; that is, swelling is a word with a broader meaning than intumescence:

Other hypernyms of intumescence include lump, puffiness.

intumescence (noun)	swelling (noun)
the increase in volume of certain substances when they are heated (often accompanied by release of water)	the increase in volume of certain substances when they are heated (often accompanied by release of water)
swelling up with blood or other fluids (as with congestion)	something that bulges out or is protuberant or projects from its surroundings
	an abnormal protuberance or localized enlargement