TRIVIAL PURSUITS: What are ghouls and goblins?

But, what are ghouls and goblins?

A ghoul is an evil demon supposed to feed on human beings, and especially to rob graves, prey on corpses, etc. The word is of Arabic origin.

A goblin is a grotesque sprite or elf that is mischievous or malicious toward people. The word’s origins can be traced to Middle English, Middle French or Middle High German.