underdrawers vs boxershorts

underdrawers and boxershorts both are nouns.

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

As nouns, underdrawers and boxershorts are synonyms defined as:

Other synonyms of underdrawers include boxers, drawers, shorts.

underdrawers (noun)	boxershorts (noun)
underpants worn by men	underpants worn by men