locking pliers vs plural

locking pliers and plural both are nouns.

Word	Noun	Adjective	Verb	Adverb
locking pliers	Yes	No	No	No
plural	Yes	Yes	No	No

locking pliers (noun)	plural (noun)
pliers that can be locked in place	the form of a word that is used to denote more than one

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