Possessive nouns and plural nouns are not the same. Possessive nouns show ownership or possession, while plural nouns indicate more than one person, place, or thing. For example, "The cat's toy" is a possessive noun, showing that the toy belongs to the cat. On the other hand, "The cats" is a plural noun, indicating that there is more than one cat. Therefore, the statement that possessive nouns are the same as plural nouns is false.