haematoma vs intumescency

haematoma and intumescency both are nouns.

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

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

Other hypernyms of haematoma include intumescence.

haematoma (noun)	intumescency (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)