Yet there is another meaning of the word wood that brings it closer to lumber than ever before: characterizing timber by its dimensional properties. One such definition considers timbers to be no smaller than 5 inches in size, as opposed to the lesser sizes of sawn wood. Lumber is thicker stock that has been planed down to a more uniform thickness. Characteristic dimensions for common woods used in construction include 1-inch-diameter boards are called spruce; 2-inch-diameter boards are called fir; and 4-inch-diameter boards are called pine. Larger sizes of these species can also be used as lumber. For example, 6-inch-diameter boards are called maple and 8-inch-diameter boards are called oak. Other hardwoods that can be used as lumber include ebony, holly, locust, sycamore, and walnut. The term "wood" alone without any further qualification means any plant material that is suitable for use as fuel. Thus, softwoods such as pine and cedar as well as hardwoods such as mahogany and teak can be used as fuel. The type of saw used to cut lumber affects how it will stack and store.