egomania vs cacoethes

egomania and cacoethes both are nouns.

Word	Noun	Adjective	Verb	Adverb
egomania	Yes	No	No	No
cacoethes	Yes	No	No	No

As nouns, cacoethes is a hypernym of egomania; that is, cacoethes is a word with a broader meaning than egomania:

egomania: an intense and irresistible love for yourself and concern for your own needs
cacoethes: an irrational but irresistible motive for a belief or action

Other hypernyms of egomania include mania, passion.

egomania (noun)	cacoethes (noun)
an intense and irresistible love for yourself and concern for your own needs	an irrational but irresistible motive for a belief or action