erotism vs sexiness

erotism and sexiness both are nouns.

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

As nouns, erotism and sexiness are synonyms defined as:

Other synonyms of erotism include amativeness, amorousness, eroticism.

erotism (noun)	sexiness (noun)
the arousal of feelings of sexual desire	The state or quality of being sexy, of possessing the traits of sexual appeal.
a state of anticipation of sexuality	the arousal of feelings of sexual desire