Nun

1. A member of a Christian religious community of women who live by certain vows and usually wear a habit, (specifically) those living together in a cloister.
2. (by extension) A member of a similar female community in other confessions.
3. A prostitute.
4. A kind of pigeon with the feathers on its head like the hood of a nun.

noun

The fourteenth letter of many Semitic alphabets/abjads (Phoenician, Aramaic, Hebrew, Syriac, Arabic and others).