plural of black coal

plural of coal mine

plural of coal-tar (alternative spelling of coal tars).

plural of coal tar

Alternative spelling of coal tar

(UK, idiomatic) Directly engaged in the operations of a business, rather than in a hands-off, managerial position.

An elevated railway track designed to allow material to fall freely between the rails onto the ground beneath. It is used to rapidly unload hoppers containing coal and other bulk materials.

plural of coal drop

lignite

(obsolete) Charcoal. / Small fragments of coal; slack.