PLANK' (5 letters) The term 'wooden board' can be summarized by two crossword solutions: 'PANEL' and 'PLANK'. A PANEL is a flat, thin piece of wood that is used in construction, furniture, and other items. A PLANK is a long, thick piece of wood that is used for flooring, walls, and other structural elements. Both panels and planks are commonly made from wood, but they can also be made from other materials such as metal or plastic.