plural vs plural form

plural and plural form both are nouns.

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

As nouns, plural and plural form are synonyms defined as:

plural and plural form: the form of a word that is used to denote more than one

plural (noun)	plural form (noun)
the form of a word that is used to denote more than one	the form of a word that is used to denote more than one

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