ghost in WordNet English dictionary

1. a mental representation of some haunting experience
   "he looked like he had seen a ghost"; "it aroused specters from his past"
   ghost  shade  spook  wraith  specter  spectre 
   
2. a suggestion of some quality
   "there was a touch of sarcasm in his tone"; "he detected a ghost of a smile on her face"
   touch  trace  ghost 
   
3. the visible disembodied soul of a dead person
   ghost 
   
4. a writer who gives the credit of authorship to someone else
   ghostwriter  ghost 
   

1. write for someone else
   "How many books have you ghostwritten so far?"
   ghost  ghostwrite 
   
2. haunt like a ghost; pursue
   "Fear of illness haunts her"
   haunt  obsess  ghost 
   
3. move like a ghost
   "The masked men ghosted across the moonlit yard"
   ghost