"phantom" in the noun sense
1. apparition, phantom, phantasm, phantasma, fantasm, specter, spectre
a ghostly appearing figure
"we were unprepared for the apparition that confronted us"
2. apparition, phantom, phantasm, phantasma, fantasm, shadow
something existing in perception only
"a ghostly apparition at midnight"
"phantom" in the adjective sense
1. phantom
something apparently sensed but having no physical reality
"seemed to hear faint phantom bells"
"the amputee's illusion of a phantom limb"
Source: WordNet® (An amazing lexical database of English)
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