In the Roman Catholic faith, what is the title for a woman in a religious order?

In the Roman Catholic faith, the correct title for a woman in a religious order is "Nun." Nuns are women who live in a religious community under vows that commit them to a life of service, prayer, and devotion, following the teachings of the Church. This term specifically refers to women who have entered into this form of life and have taken solemn or simple vows.

The term "Deaconess" is generally associated with a specific order in some Protestant traditions and is not commonly used in the Roman Catholic context to describe female religious figures. "Pastor" refers to a clergyman or priest in charge of a church, typically associated with Protestant denominations, and does not apply to women in religious orders within the Catholic Church. "Priestess" is a term that denotes a female priest in pagan or polytheistic religions, which is not applicable within the structure of the Roman Catholic faith, as women cannot be priests.