Possessive pronouns are pronouns that express possession of or some other relationship to another word or phrase and can perform five functions in clauses: subject, subject complement, direct object, indirect object, and prepositional complement.
Possessive pronoun is a grammatical form.
Possessive pronoun is a subcategory of pronoun, which is a subcategory of noun.
Possessive pronouns function as the heads of pronoun phrases or noun phrases.
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Hopper, Paul J. 1999. A short course in grammar. New York: W. W. Norton & Company.
Huddleston, Rodney. 1984. Introduction to the grammar of English. Cambridge: Cambridge University Press.