rib joint pliers vs plural

rib joint pliers and plural both are nouns.

Word	Noun	Adjective	Verb	Adverb
rib joint pliers	Yes	No	No	No
plural	Yes	Yes	No	No

rib joint pliers (noun)	plural (noun)
a type of pliers, the pivot of which may be moved to expand its gripping range	the form of a word that is used to denote more than one

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