Main entry: wraith, ghost, shade, specter, spectre, spook
Definition: a mental representation of some haunting experience
Usage: he looked like he had seen a ghost; it aroused specters from his past
Main entry: creep, weirdie, weirdo, weirdy, spook
Definition: someone unpleasantly strange or eccentric
Main entry: spook
Definition: frighten or scare, and often provoke into a violent action
Usage: The noise spooked the horse