Spook

Noun

 * 1) A spirit returning to haunt a place.
 * The visit to the old cemetery brought scary visions of spooks and ghosts.
 * 1) A ghost or an apparition.
 * 2) A hobgoblin.
 * 3)  A spy.
 * 4)  A black person.

Verb

 * 1) To scare or frighten.
 * 2) To startle or frighten an animal