Buttock and Rump

Buttock noun - Either of the two large fleshy masses of muscular tissue that form the human rump.

Rump and buttock are semantically related in bottom topic. In some cases you can use "Rump" instead a noun "Buttock", when it comes to topics like butt, over.

Rump noun - The part of the body upon which someone sits.

Buttock and rump are semantically related in butt topic. You can use "Buttock" instead a noun "Rump", if it concerns topics such as over.