The term CHIMNEY PART refers to the components of a chimney. The four-letter solution FLUE is an enclosed passageway for smoke and hot gases to travel up and out of a building. The ten-letter solution SMOKESTACK is a tall vertical pipe or structure that is used to vent smoke and other gases from a fireplace, furnace, or boiler. The four-letter solution COWL is a hood or cover that is placed over the top of a chimney to prevent rain and snow from entering the FLUE.