Why do we put ress at the end of some words, like actress, mayoress and murderess, but not for others like doctress, accountantress, or teacheress?

Question

Why do we put ress at the end of some words, like actress, mayoress and murderess, but not for others like doctress, accountantress, or teacheress?

In: 12609

Answer 1

I thought the term actress was going out of style – I see people say actor now as a universal term – actor, person who acts.