shorts vs underpants

shorts and underpants both are nouns.

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

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

shorts: underpants worn by men
underpants: an undergarment that covers the body from the waist no further than to the thighs; usually worn next to the skin

shorts (noun)	underpants (noun)
(used in the plural) trousers that end at or above the knee	an undergarment that covers the body from the waist no further than to the thighs; usually worn next to the skin
underpants worn by men