Nun

River Song disguised as a nun. (AUDIO: The Eighth Piece)

Nuns were female members of a monastic religious order. In the looser sense, nuns could also be members of a religious sisterhood devoted to service such as treating the sick.

Nuns already existed around the time of King Arthur's reign. Ganeida's mother was a nun. (PROSE: A Honeycomb of Souls)

River Song once disguised herself as a nun, calling herself "Sister Cantica" and wearing a psychic wimple. This disguise worked in 15th century Prague, 16th century England and 21st century Rome. (AUDIO: The Eighth Piece)

Sister Julienne was a nun who represented Nonnatus House in the 20th century.

On Earth in the 20th to early 21st century a sisterhood of nuns were manipulated by a Gorgon, it was defeated by Sarah Jane Smith, Luke Smith, Maria Jackson and Clyde Langer. (TV: Eye of the Gorgon)

One of Amy Pond's kissogram costumes was a nun's outfit. (TV: The Eleventh Hour)

A group of nuns (with guns) helped the Eleventh Doctor and Amy Pond dispel a time field. (COMIC: Apotheosis)

The Twelfth Doctor stated that he had once disguised himself as a nun to escape the Church of Vindication's inquisitors. (COMIC: The Swords of Kali)

On New Earth in 5,000,000,023 an order known as the Sisters of Plenitude operated the hospital outside New New York. (TV: New Earth)

On July 16th 1918, Barbara Wright and Susan Foreman were instructed by Thomas Preston to disguise themselves as nuns to infiltrate the house of Nicholas II. (AUDIO: Last of the Romanovs)