coal

(noun) fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period.

(noun) a hot fragment of wood or coal that is left from a fire and is glowing or smoldering. Synonyms: ember.

(verb) burn to charcoal. Synonyms: char. Example: "Without a drenching rain, the forest fire will char everything."

(verb) supply with coal.

(verb) take in coal. Example: "The big ship coaled."