layman

Layperson, someone who is not an ordained cleric or member of the clergy.

Someone who is not a professional in a given field.

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

Let me explain it to you [[in layman's terms|in layman's terms]].

A common person.

A person who is untrained or lacks knowledge of a subject.

should he be held to be just a layman, or does he have some art?

Lay-sister or lay-brother, person received into a convent of monks, following the vows, but not being member of the order.

A surname.