A classification of Pronouns on the basis of person, case and number.
A more detailed and discerning classification is found below
In the above chart, Possessive Adjectives are shown as distinct and different from Possessive Pronouns.
Possessive Adjectives modify nouns, hence they are called Adjectives.
It is Alice’s car.
It is her car
“her” replaces “Alice’s”
It is John’s book
It is his book
“his” replaces “John’s”
It is our school
It is their property
In all the above cases, the possessives (her, his) modify a noun (car, book) and hence they are Adjectives. Since they also replace nouns (Alice’s, John’s) in the possessive case, they referred to as pronouns.
On the contrary, pronouns such as ours, mine, theirs, his, hers are called Absolute possessives because they can stand on their own.
(Note: his and its perform both roles of Absolute Possessive and Possessive Adjective).