"spectre" 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. ghost, shade, spook, wraith, specter, spectre
a mental representation of some haunting experience
"he looked like he had seen a ghost"
"it aroused specters from his past"
Source: WordNet® (An amazing lexical database of English)
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