The Fruit that Copra is Obtained From

I don't think it's possible to be both a fruit and a nut. A coconut is called a nut, but that doesn't make it a nut.

According to Wikipedia, a coconut is a drupe, which is a fruit with a stone (a peach is another example of a drupe). The thing that we think of as a coconut (with a hard shell, the white edible part inside it, and the milk in the hollow inside that) is actually the stone.

Also: copra is not an oil; it's the dried 'meat' of the coconut (the edible, white part – referred to on Wikipedia as "the meat or kernel"). Wikipedia says that "Coconut oil is extracted from copra".

On its Coconut oil page, Wikipedia does suggest that coconut oil is also known as copra oil. But I take that to mean "oil extracted from copra" – not "an oil called copra".