Butternut
the fruit of juglans cinerea, or white walnut, an American tree, so called from the oil it contains.
The tree bears a resemblance in its general appearance to the black walnut, but the wood is not so dark in color. The same name is given to the nut of caryocar butyraceum and C. nuciferum of South America, also known as suwarrow, or suwarra nut.