Is her a proper noun or a common noun?

Answer 1

The word 'her' is not a noun. The word 'her is a pronoun; an objective personal pronoun and a possessive adjective.

A personal pronoun is a word that takes the place of a noun for a specific person or thing.

A possessive adjective is a word that is placed before a noun to describe that noun as belonging to a specific person or thing.

For example:

'This is her house.' (Possessive adjective.)

'Please give her this book.' (Indirect object personal pronoun.)

'I love her.' (Direct object personal pronoun.)

Answer 2

The word 'her' is not a noun. The word 'her' is a personal pronoun, a word that takes the place of a noun for a specific person as the object of a verb or a preposition in a sentence; and a possessive adjective, a word that describes a noun as belonging to a specific person. Examples:

Personal pronoun:

We spoke to her at the mall. She said to say 'hello'. (Note: the pronoun 'she' is the personal pronoun for the subject of a sentence or a clause.)

Possessive adjective:

Her mother made lunch for us.