briefs vs Jockey shorts

briefs and Jockey shorts both are nouns.

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

As nouns, briefs and Jockey shorts are synonyms defined as:

briefs and Jockey shorts: (used in the plural) short tight-fitting underpants (trade name Jockey shorts)

briefs (noun)	Jockey shorts (noun)
(used in the plural) short tight-fitting underpants (trade name Jockey shorts)	(used in the plural) short tight-fitting underpants (trade name Jockey shorts)