Orcs and goblins are the same thing. as stated before goblin was used in the Hobbit and orcwas used in LotR. Uruk Hai are the more poweful orcs. they are possibly a mix between orcs and men bred by Saruman. Uruk is just Black Speech for orc.
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'They say that the One will himself enter into Arda, and heal Men and all the Marring from the beginning to the end."
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