spook spook

noun

a mental representation of some haunting experience  ( ghost, shade, specter, spectre, spook, wraith )
a mental representation of some haunting experience
 he looked like he had seen a ghost
he looked like he had seen a ghost
 it aroused specters from his past
it aroused specters from his past

someone unpleasantly strange or eccentric  ( creep, spook, weirdie, weirdo, weirdy )
someone unpleasantly strange or eccentric

verb

frighten or scare, and often provoke into a violent action  ( spook )
frighten or scare, and often provoke into a violent action
 The noise spooked the horse
The noise spooked the horse