Is wife a subject or object pronoun?

The Word 'wife' is not a pronoun.

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

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

Examples:

The doctor's wife works in his office. She does the bookkeeping.

• The personal pronoun 'she' takes the place of the noun 'wife' as the subject of the second sentence.

His wife got a new car. The blue Honda in the driveway is hers.

• The possessive pronoun 'hers' takes the place of the noun 'wife' showing ownership of the blue Honda.

My wife is visiting her mother.

• The possessive adjective 'her' describes the noun 'mother'.

The gallery owner's wife is herself a well known artist.

• The reflexive pronoun 'herself' reflect back to the noun 'wife'.