hot pants vs trunks

hot pants and trunks both are nouns.

Word	Noun	Adjective	Verb	Adverb
hot pants	Yes	No	No	No
trunks	Yes	No	No	No

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

hot pants: skin-tight very short pants worn by young women as an outer garment
trunks: (used in the plural) trousers that end at or above the knee

Other hypernyms of hot pants include short pants, shorts.

hot pants (noun)	trunks (noun)
skin-tight very short pants worn by young women as an outer garment	(used in the plural) trousers that end at or above the knee
a state of sexual arousal