The lower jaw, also known as the MANDIBLE (8 letters), is the only movable bone in the human skull. It is connected to the rest of the skull by muscles and ligaments. The lower jaw is responsible for the formation of the face, and it is made up of two parts: the JOWL (4 letters) and the CHIN (4 letters). The JOWL is the fleshy part of the lower jaw that hangs down from the sides of the face, while the CHIN is the protruding part of the lower jaw located at the front of the face.