Backs and Bones

Bones and backs are semantically related. In some cases you can use "Bones" instead a noun "Backs".

Bones 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.

Backs and bones are semantically related. Sometimes you can use "Backs" instead a noun "Bones".