The term 'PART OF BACKBONE' can be solved by the 8-letter word 'VERTEBRA'. A VERTEBRA is a bone in the spine that forms part of the backbone. It is made up of a body, a vertebral arch, and several processes. The vertebral arch consists of two pedicles and two laminae, and the processes include the spinous process, transverse process, and articular process. Together, these bones form the spinal column, which provides support for the body and protects the spinal cord.