Here's the link to a good essay explaining why Tolkien used both terms goblin and Orc. Since it wasn't written by him, I don't know that it would be considered 'canon,' but it's good anyways. Relationship between goblins and Orcs
Arwen
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Will Turner: "This is either madness or brilliance."
Jack Sparrow: "It's remarkable how often those two traits coincide." ~ Pirates of the Caribbean
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