A possessive pronoun is a type of pronoun that designates ownership or possession. Synonyms for "possessive pronoun" include possessive adjective, possessive determiner, and genitive pronoun. A possessive adjective is a word that is used to modify a noun to indicate ownership, such as "my" or "their". A possessive determiner is a word that is used to introduce a noun or noun phrase that indicates possession, such as "his" or "her". A genitive pronoun is a type of possessive pronoun that indicates ownership in a more formal or literary context, such as "mine" or "ours". Overall, these synonyms help to clarify the different types and uses of possessive pronouns in English grammar.