plural vs plural form

plural

adj
  • Pluralistic. 

  • Consisting of or containing more than one of something. 

  • In systems of number, not singular or not singular or dual. 

noun
  • A person with some form of multiplicity, particularly dissociative identity disorder. 

  • The plural number. In English, referring to more or less than one of something. 

  • A word in the form in which it potentially refers to something other than one person or thing; and other than two things if the language has a dual form. 

plural form

How often have the words plural and plural form occurred in a corpus of books? (source: Google Ngram Viewer )