Specter

n.	1.	Something preternaturally visible; an apparition; a ghost; a phantom. The ghosts of traitors from the bridge descend, With bold fanatic specters to rejoice. - Dryden.
	2.	(Zool.) The tarsius. Specter bat (Zool.) any phyllostome bat. Specter candle (Zool.) a belemnite. Specter shrimp (Zool.) a skeleton shrimp. See under Skeleton.

Noun	1.	specter - a mental representation of some haunting experience; "he looked like he had seen a ghost"; "it aroused specters from his past" Synonyms: ghost, wraith, spectre, spook, shade
	2.	specter - a ghostly appearing figure; "we were unprepared for the apparition that confronted us" Synonyms: apparition, phantasm, phantasma, phantom, spectre

apparition, disembodied spirit, Flying Dutchman, phantasm, phantasma, phantom, spectre, spirit