Bones and Bone up

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.

Bone up is a synonym for bones. In some cases you can use "Bone up" instead a verb "Bones".

Bone up verb - To use the mind to acquire knowledge.

Bones is a synonym for bone up. Sometimes you can replace term "Bones" with "Bone up", this verbs are similar.