haematoma vs intumescence

haematoma and intumescence both are nouns.

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

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

Other hypernyms of haematoma include intumescency.

haematoma (noun)	intumescence (noun)
a localized swelling filled with blood	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)