erotism vs eros

erotism and eros both are nouns.

Word	Noun	Adjective	Verb	Adverb
erotism	Yes	No	No	No
eros	Yes	No	No	No

As nouns, eros is a hypernym of erotism; that is, eros is a word with a broader meaning than erotism:

Other hypernyms of erotism include concupiscence, physical attraction, sexual desire.

erotism (noun)	eros (noun)
the arousal of feelings of sexual desire	a desire for sexual intimacy
a state of anticipation of sexuality