Jockey shorts vs briefs

Jockey shorts and briefs both are nouns.

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

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

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

Jockey shorts (noun)	briefs (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)