haunter

noun

1. One who haunts.

   “As an angst-ridden teenager, I was a haunter of smoke-filled coffee shops and dingy second-hand bookstores.”

   “It has been computed, that by intrusting a well-concocted and tolerably interesting lie, in strictest confidence, to two fashionable Galens, in full practice, and four determined morning visitors or levee haunters, the story will reach 7,963 individuals in the course of four-and-twenty hours,—[…]”

2. A ghost; a spirit that haunts.