Peanuts are in fact not a nut.  Peanuts are legumes, which contain the properties of both a bean or lentil. Other names for  peanuts are earthnuts, ground nuts, goober peas, monkey nuts, pygmy nuts, and pig nuts. Peanuts are also highest in protein of all nuts. 1/3 cup contains more than 11 grams of protein, 22 percent of the daily value.