Well to sum it all up in short, for your first question:
What exactly are Uruk-hai?
As i recall, the Uruk-Hai were great soldier orcs of the Third age who were born and bred for battle, and could also able to endure the rays of the sun (as ordinary orcs could not)
what is the difference between orcs and goblins?
There seems to be little difference between the two. But the Goblins are shorter than the Orcs in apperance. This quote from 'The Hobbit' indicates there is a difference between the two:
Quote:
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"[The Word'Orc'] occurs in one or two places but is usually translated goblin (or hobgoblin for the larger kinds)."
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This quote refers to the goblins of the Grey and Misty Mountains.
Quote from: Foreward to The Hobbit
[ January 26, 2003: Message edited by: Iargwath ]
[ January 27, 2003: Message edited by: Iargwath ]