Jockey shorts vs plural

Jockey shorts and plural both are nouns.

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

Jockey shorts (noun)	plural (noun)
(used in the plural) short tight-fitting underpants (trade name Jockey shorts)	the form of a word that is used to denote more than one

Jockey shorts (adjective)	plural (adjective)
	grammatical number category referring to two or more items or units
	composed of more than one member, set, or kind