Carbon
noun, の adjective
たんそ
炭 (すみ) Charcoal
石炭 (せきたん) Coal
炭素 (たんそ) Carbon
金 (きん) Gold
銀 (ぎん) Silver
銅 (どう、not on WK) Copper
鉄 (てつ、not on WK) Iron
水銀 (すいぎん) Mercury, Quicksilver
酸素 (さんそ) Oxygen
窒素 (ちっそ) Nitrogen
硫黄 (いおう) Sulfur, Sulphur
酵素 (こうそ) Enzyme
Charcoal comes from burned wood. Coal comes from rocks in a mine. They both contain the element Carbon.