cephalhematoma vs hematocyst

cephalhematoma and hematocyst both are nouns.

Word	Noun	Adjective	Verb	Adverb
cephalhematoma	Yes	No	No	No
hematocyst	Yes	No	No	No

As nouns, hematocyst is a hypernym of cephalhematoma; that is, hematocyst is a word with a broader meaning than cephalhematoma:

cephalhematoma: a collection of blood under the scalp of a newborn; caused by pressure during birth
hematocyst: a cyst containing blood

Other hypernyms of cephalhematoma include blood cyst, hemorrhagic cyst.

cephalhematoma (noun)	hematocyst (noun)
a collection of blood under the scalp of a newborn; caused by pressure during birth	a cyst containing blood