dark glasses vs plural form

dark glasses and plural form both are nouns.

Word	Noun	Adjective	Verb	Adverb
dark glasses	Yes	No	No	No
plural form	Yes	No	No	No

dark glasses (noun)	plural form (noun)
(plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun	the form of a word that is used to denote more than one