Back end and Rump

Back end noun - The side of an object that is opposite its front.

Rump and back end are semantically related. in rear topic. In some cases you can use "Rump" instead a noun phrase "Back end", when it comes to topics like back or end part, animate rear end.

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

Back end and rump are semantically related. Sometimes you can use "Back end" instead a noun "Rump".