The noun ghost has 4 senses (first 1 from tagged texts)
1. (4) 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")
2. ghostwriter, ghost -- (a writer who gives the credit of authorship to someone else)
3. ghost -- (the visible disembodied soul of a dead person)
4. touch, trace, ghost -- (a suggestion of some quality; "there was a touch of sarcasm in his tone"; "he detected a ghost of a smile on her face")
Overview of verb ghost
The verb ghost has 3 senses (first 1 from tagged texts)
1. (1) ghost -- (move like a ghost; "The masked men ghosted across the moonlit yard")
2. haunt, obsess, ghost -- (haunt like a ghost; pursue; "Fear of illness haunts her")
3. ghost, ghostwrite -- (write for someone else; "How many books have you ghostwritten so far?")