hot pants vs sexual arousal

hot pants and sexual arousal both are nouns.

Word	Noun	Adjective	Verb	Adverb
hot pants	Yes	No	No	No
sexual arousal	Yes	No	No	No

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

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

hot pants (noun)	sexual arousal (noun)
skin-tight very short pants worn by young women as an outer garment	the arousal of sexual desires in preparation for sexual behavior
a state of sexual arousal