ghoster

Noun

 * 1)  A ghosthunter; a paranormal investigator.
 * 2)  A very lightweight headsail.
 * 3)  A vessel that sails seemingly without wind.
 * 4)  One who ghosts or ignores another person.
 * 1)  One who ghosts or ignores another person.

Etymology
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Verb

 * 1) to ghost; to perform an act of ghosting