And because of this name switch, some physical elements were implimented. Everytime in The Hobbit when orcs are dealt with, they are orcs of the mountains, ie goblins. So as we know Saurons Uruks were developed more than this survivors of the Second and First age, these older divisions would appear as stouter and more "elvish" in a sense. Also, in a general non-Tolkien aspect, when one thinks of goblin, they usualy think of a smaller creature, right? (um, right?) While Uruks of Mordor and Isenguard are more Mannish and Humanoid.
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