Layman

Noun

1. Layperson, someone who is not an ordained cleric or member of the clergy.
2. Someone who is not a professional in a given field.

   "Carmen is not a professional anthropologist, but strictly a layman."

3. A common person.
4. A person who is untrained or lacks knowledge of a subject.
5. Lay-sister or lay-brother, person received into a convent of monks, following the vows, but not being member of the order.