plural vs slip-joint pliers

plural and slip-joint pliers both are nouns.

Word	Noun	Adjective	Verb	Adverb
plural	Yes	Yes	No	No
slip-joint pliers	Yes	No	No	No

plural (noun)	slip-joint pliers (noun)
the form of a word that is used to denote more than one	pliers with a joint adjustable to two positions in order to increase the opening of the jaws

plural (adjective)	slip-joint pliers (adjective)
grammatical number category referring to two or more items or units
composed of more than one member, set, or kind