Layman and Lay person

Layman noun - A person who regularly or occasionally engages in an activity as a pastime rather than as a profession.

Lay person and layman are semantically related. in amateur topic. In some cases you can use "Lay person" instead a noun "Layman", when it comes to topics like nonprofessional.

Layman and lay person are semantically related. You can use "Layman" instead a noun phrase "Lay person".