When Bilbo and the Dwarves ask Gandalf if they have to go through the forest, or could they go around it? Gandalf then said they couldn't go south of it because of the Necromancer. Then he said north they would run into all kinds of goblins, hobgoblins, and orcs. What is the difference between the three? I've never heard of hobgoblins anywhere else, I've never remember hearing of orcsin The Hobbit, but in the LOTR orcs seem to replace the word orcs. What's the deal?