specter

noun specter

• apparition — An apparition is someone you see or think you see but who is not really there as a physical being.
• appearance — When someone makes an appearance at a public event or in a broadcast, they take part in it.
• banshee — In Irish folk stories, a banshee is a female spirit who warns you by her long, sad cry that someone in your family is going to die.
• bogey — A bogey is something or someone that people are worried about, perhaps without much cause or reason.
• bogeyman — A bogeyman is someone whose ideas or actions are disapproved of by some people, and who is described by them as evil or unpleasant in order to make other people afraid.