WRAITH
ghost, shade, spook, wraith, specter, spectre
(noun) a mental representation of some haunting experience; “he looked like he had seen a ghost”; “it aroused specters from his past”
Source: WordNet® 3.1
Etymology
Noun
wraith (plural wraiths)
A ghost or specter, especially a person's likeness seen just after their death.
Synonym: Thesaurus:ghost
Source: Wiktionary
Wraith, n. Etym: [Scot. wraith, warth; probably originally, a
guardian angel, from Icel. vörthr a warden, guardian, akin to E.
ward. See Ward a guard.]
1. An apparition of a person in his exact likeness, seen before
death, or a little after; hence, an apparition; a specter; a vision;
an unreal image. [Scot.]
She was uncertain if it were the gypsy or her wraith. Sir W. Scott.
O, hollow wraith of dying fame. Tennyson.
2. Sometimes, improperly, a spirit thought to preside over the
waters; -- called also water wraith. M. G. Lewis.
Source: Webster’s Unabridged Dictionary 1913 Edition