Injun is the equivalent of negroe. Impolite, not offensive. "Redskin" and "******" are insults that denote utmost contempt. Remember what Franklin, Lincoln, and Twain said, "it's better to be thought a fool and remain silent, than to open your mouth and remove all doubt"
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IT'S A GOOFY BALL, MATTHEW. NOT A SUPER COMPUTER.
I'd say if it denotes skin color, "Redskin" is closer to Negro. It also bears mentioning that negro is an actual word, it simply is Spanish for "black." No African American objects to being called black in English.