A bone was part of a skeleton.
According to Martha Jones, the carpal bones of the human hand included, on the proximal row, scaphoid, lunate, triquetal and pisiform, and on the distal row, trapezium, trapezoid, capitate and hamate. The metacarpal bones extended into three distinct phalanges: proximal, middle and distal. (TV: The Family of Blood)
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)
Before killing his victims, Zebulon Pryce would use coronic acid to slowly remove the flesh from their bones while leaving the nerves and circulatory system intact. (PROSE: Original Sin)
The Twelfth Doctor named the two-dimensional beings that he encountered in Bristol "the Boneless". (TV: Flatline)
On Corbo, the TARDIS materialised on a pile of bones which formed an island in a swamp. (PROSE: The Devil-Birds of Corbo)