I dont think thay were a separate race, but were still different to orcs. Where in the books does he use the names interchangeably? as far as I know, he always says orcs for those from isengard or mordor (or uruk hai) and always goblins in, say, the hobbit.
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The 'hum' generated by an electric car is not in fact the noise of the engine, but that of the driver's self-righteousness oscillating at a high frequency.
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