Ember
a hot rock
ember
ember cinder ash clinker coal
Another name for bituminous coal is soft coal.
It is sometimes called a diamond - as in the suit in playing cards, not a jumped-up piece of coal!
anthracite is another name for coal
ether
A coal hewer is another name for a coal miner. It is a name that is given to the men often seen with coal dust and ash on their faces.
A burning lump of coal is called Ember
scuttle
Coal. Carbonado
eye piece
Vein and/or Peat (depending on reference, peat is the beginning form of coal).
rhombus, quadrilateral.