shorts vs boxershorts

shorts and boxershorts both are nouns.

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

As nouns, shorts and boxershorts are synonyms defined as:

Other synonyms of shorts include boxers, drawers, underdrawers.

shorts (noun)	boxershorts (noun)
(used in the plural) trousers that end at or above the knee	underpants worn by men
underpants worn by men