A toothed wheel is a type of wheel that has teeth or cogs along its edge. The four letter solution, GEAR, is a toothed wheel that is used to transfer rotational motion from one shaft to another. The eight letter solution, SPROCKET, is a toothed wheel with teeth that are designed to mesh with a chain. The seven letter solution, RATCHET, is a toothed wheel that is used to allow movement in one direction only. The three letter solution, COG, is a toothed wheel that is used to transmit power between two parallel shafts. The five letter solution, ROWEL, is a toothed wheel with sharp points that is used as a spur on a horse's bridle. The eight letter solution, ROULETTE, is a toothed wheel with numbered slots that is used in a gambling game.