phantom

[1]	apparition , apparition , phantasm , spectre , ghost , phantasma , fantasm , spirit , phantasm , specter , spectre , shade , wraith , revenant , vision , (Formal) eidolon , phantasma , (Colloq) spook
[2]	figment (of the imagination) , apparition , phantasm , illusion , delusion , phantasma , fantasm , chimera/chimaera , hallucination , shadow , fancy , mirage