Bugbear
From BiblePortal Wikipedia
Bugbear [1]
(1): (n.) Something frightful, as a specter; anything imaginary that causes needless fright; something used to excite needless fear; also, something really dangerous, used to frighten children, etc.
(2): (n.) Same as Bugaboo.
(3): (a.) Causing needless fright.
(4): (v. t.) To alarm with idle phantoms.