A bone was part of a skeleton.
The bones of Saint Nicholas were kept in a church named for him in Myra. After some sailors from Bari stole the bones, the Second Doctor retrieved them from their ship and replaced them with plastic ones. (PROSE: Saint Nicholas's Bones)
Permians appeared to be animated skeletons of theropod dinosaurs (despite predating dinosaurs by millions of years), their bodies composed of bone and cartilage and held together by a bioelectric field generated by the brain. (AUDIO: The Land of the Dead)