aneurysm vs aneurism

aneurysm and aneurism both are nouns.

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

As nouns, aneurysm and aneurism are synonyms defined as:

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

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