spectre

noun4

1. •
   A ghostly apparition, a phantom.

   • A specter haunted the cemetery at the old Vasquez manor.
2. •
   (figurative) A threatening mental image; an unpleasant prospect

   • The specter of an election-vote recount is this year's political bogeyman.
3. •
   Any of various species of Asian danaid butterflies of the genus Idea, family Nymphalidae.
4. •
   Any of certain species of dragonfly of the genus Boyeria, family Aeshnidae.