noun. A ghost; a specter.

noun. A secret agent; a spy.

noun. Used as a disparaging term for a black person.

intransitive verb. To haunt.

intransitive verb. To startle and cause nervous activity in; frighten.

intransitive verb. To become frightened and nervous.

To play the spook.

noun. A ghost; a hobgoblin.

noun. A spirit; a ghost; an apparition; a hobgoblin.

noun. The chimæra.

noun. A spirit returning to haunt a place.

noun. A ghost or an apparition.

noun. A hobgoblin.

noun. A spy.

noun. A scare or fright.

noun. A black person.

verb. To scare or frighten.

verb. To startle or frighten an animal

verb. frighten or scare, and often provoke into a violent action

noun. someone unpleasantly strange or eccentric

noun. a mental representation of some haunting experience

"I love the teeny torpedo for my home river fishing smallies, and the spook is a close second for Smallmouth also."

Wikipedia article on ghosts  

affright  apparition  disagreeable person  fantasm  fright  

Baruch  Dubuque  Duke  Luke  Wouk  

bogies  catchwords  ghoul  phylactery  politicos  

Masan  affright  agent  agitate  alarm  

spuke  

spooked  spooking  spooks