lasciviousness vs sexiness

lasciviousness and sexiness both are nouns.

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

As nouns, sexiness is a hypernym of lasciviousness; that is, sexiness is a word with a broader meaning than lasciviousness:

Other hypernyms of lasciviousness include amativeness, amorousness, eroticism, erotism.

lasciviousness (noun)	sexiness (noun)
feeling morbid sexual desire or a propensity to lewdness	The state or quality of being sexy, of possessing the traits of sexual appeal.
	the arousal of feelings of sexual desire