Jockey shorts vs underpants

Jockey shorts and underpants both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jockey shorts	Yes	No	No	No
underpants	Yes	No	No	No

As nouns, underpants is a hypernym of Jockey shorts; that is, underpants is a word with a broader meaning than Jockey shorts:

Jockey shorts: (used in the plural) short tight-fitting underpants (trade name Jockey shorts)
underpants: an undergarment that covers the body from the waist no further than to the thighs; usually worn next to the skin

Jockey shorts (noun)	underpants (noun)
(used in the plural) short tight-fitting underpants (trade name Jockey shorts)	an undergarment that covers the body from the waist no further than to the thighs; usually worn next to the skin