The Oxford Thesaurus An A-Z Dictionary of Synonyms - ghost n.

1) apparition, phantom, spectre, phantasm, shade, spirit, wraith, poltergeist, banshee, double-ganger, Doppelganger, ghoul, manes, No. Eng. dialect boggart; hallucination, illusion, vision; Colloq spook: The ghost of his uncle appeared before him. 2) hint, suggestion, shadow, trace, scintilla, glimmer: Vera hasn't the ghost of a chance of meeting anyone suitable at the office.