I always thought that the goblins and orcs were the same basic creature. The difference between orcs and goblins is more of a lifestyle difference rather than a physical difference. Orcs my seem bigger and stronger because Sauron wants them to be so they are better in fighters. It seems to me that goblins are orcs that are not completely governed by Sauron. They have their own system of government and can choose what reasons to fight this group or another. Orcs on the other hand don't govern themselves and listen to Sauron and his allies.
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Elwood: It's 106 miles to Chicago. We got a full tank of gas, half a pack of cigarettes; it's dark and we're wearing sunglasses.
Jake: Hit it!
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