I always thought a ghoul was a LIVING person who ate people- not a reanimated corpse.
According to dictionary.com, the defining quality of a ghoul is that they rob graves, and also they mention they are often demons or evil spirits:
http://dictionary.reference.com/browse/ghoul
None of this seems to fit with zombie lore. They don't rob graves- they look for living victims, and they certainly aren't demons or spirits.
I'll have to disagree with Doc & crabby.
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