There are four types of possessive nouns: singular possessive nouns, plural possessive nouns, possessive pronouns, and irregular possessive nouns.

Singular possessive nouns (i.e., “Jessica’s book”) Plural possessive nouns (i.e., “students’ notebooks”) Possessive pronouns (i.e., “hers” or “its”) Irregular possessive nouns (i.e., “children’s toys”, “men’s clothing”)