intumescency vs swelling

intumescency and swelling both are nouns.

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

As nouns, intumescency and swelling are synonyms defined as:

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

Other synonyms of intumescency include intumescence.

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

Other hypernyms of intumescency include lump, puffiness.

intumescency (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