layman

One who is not a cleric.

One who is a nonprofessional in a given field.

An unprofessional man; a man belonging to the laity or general mass of people, as distinguished from members of the professions of divinity, law, and medicine; specifically, one who does not belong to the clerical profession; more particularly, a church-member who is not a clergyman: also sometimes applied to persons with reference to any other profession or occupation in which they are not expert.

Same as lay-figure, 1.

One of the people, in distinction from the clergy; one of the laity; sometimes, a man not belonging to some particular profession, in distinction from those who do.

A lay figure. See under Lay, n. (above).

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

by analogy, someone who is not a professional in a given field

a common person

a person who is untrained or lacks knowledge of a subject