hotness vs sexual arousal

hotness and sexual arousal both are nouns.

Word	Noun	Adjective	Verb	Adverb
hotness	Yes	No	No	No
sexual arousal	Yes	No	No	No

As nouns, sexual arousal is a hypernym of hotness; that is, sexual arousal is a word with a broader meaning than hotness:

hotness: a state of sexual arousal
sexual arousal: the arousal of sexual desires in preparation for sexual behavior

hotness (noun)	sexual arousal (noun)
the presence of heat	the arousal of sexual desires in preparation for sexual behavior
a hot spiciness
a state of sexual arousal