Because it is made from peanuts but has the consistency of butter.
Its got the same consistancy of butter, but its made of peanuts.
No. Peanut butter contains peanuts.
I've never seen peanut butter with butter in it. So it might be possible, but it would have to be pretty rare.
Well, it is made from peanuts because it is peanut butter. It is like apple butter is made from an apple. Almond butter is made from almonds.