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I am wife, mother, teacher. The formal way of addressing me is "Mrs."i am Catholic and prefer the term sister
The OP's question was what term is preferred and what Catholics v Protestants say about that.
As for how to address an individual nun, I agree that she should be called Sister.
I believe that is what I said.ok
but my question was less about how to address them
more how to refer to them
Nun is a position in the church like Priest
Sister is a title like Father