Clappers and Observers

Clappers noun - A percussion instrument consisting of a pair of hollow pieces of wood or bone (usually held between the thumb and fingers) that are made to click together (as by Spanish dancers) in rhythm with the dance.

Observers and clappers are semantically related. In some cases you can use "Observers" instead a noun "Clappers".

Clappers and observers are semantically related. Sometimes you can replace term "Clappers" with "Observers", this words are similar.