> > If a lurker may make a related observation: I tried the Word Trivia, and it asked me what an incubus was. Now, as a veteran Nethack player, I know that an incubus is a male demon that comes down to earth to sleep with women. Accordingly, I chose "demon" from the list of choices, and was told that the correct answer is "nightmare".>>

If Word Trivia is looking for answers which involve the roots of English words, then this is a correct answer. 'Incubus' is the Latin word for 'nightmare'.