Is mother an object pronoun or subject pronoun?

The Word 'mother' is not a pronoun.

The Word 'mother' is a noun, a Word for a person.

The noun 'mother' functions as the subject or the object in a sentence.

Examples:

Mother taught me to knit. - subject.

I will see mother tomorrow - object.

A pronoun is a Word that take the place of a noun in a sentence.

The pronouns that take the place of the noun 'mother' are she as a subject and her as an object in a sentence.

Examples:

She taught me to knit. - subject.

I will see her tomorrow - object.