Answer:
Possessive nouns are, as the name suggests, nouns used to show possession of an object. Possessive nouns are achieved by using an apostrophe in conjunction with a noun. For example: Timmy's dog is brown. In this sentence, Timmy's is a possessive noun, as the apostrophe exists to show that the dog belongs to Timmy. Possessive pronouns, accordingly, replace a noun or noun phrase to avoid unnecessary repetition. There are eight possessive pronouns in the English language: mine, yours, his, hers, its, ours, theirs and whose, although its is rarely used as a pronoun. For example: Where are my books? Yours are over there; these books are mine. Both yours and mine are possessive pronouns in this sentence.