cephalohematoma vs blood cyst

cephalohematoma and blood cyst both are nouns.

Word	Noun	Adjective	Verb	Adverb
cephalohematoma	Yes	No	No	No
blood cyst	Yes	No	No	No

As nouns, blood cyst is a hypernym of cephalohematoma; that is, blood cyst is a word with a broader meaning than cephalohematoma:

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

Other hypernyms of cephalohematoma include hematocyst, hemorrhagic cyst.

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