Laity and Sit in

Laity noun - In Christianity, members of a religious community that do not have the priestly responsibilities of ordained clergy.

Sit in and laity are semantically related In some cases you can replace term "Sit in" with "Laity", this nouns are similar.

Sit in verb - Attend as a visitor.

Laity and sit in are semantically related in assembled group topic. Sometimes you can use "Laity" instead a noun "Sit in".