cerebral aneurysm vs aneurysm

cerebral aneurysm and aneurysm both are nouns.

Word	Noun	Adjective	Verb	Adverb
cerebral aneurysm	Yes	No	No	No
aneurysm	Yes	No	No	No

As nouns, aneurysm is a hypernym of cerebral aneurysm; that is, aneurysm is a word with a broader meaning than cerebral aneurysm:

cerebral aneurysm: an aneurysm of the carotid artery
aneurysm: a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall

Other hypernyms of cerebral aneurysm include aneurism.

cerebral aneurysm (noun)	aneurysm (noun)
an aneurysm of the carotid artery	a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall