ghost

Haunt like a ghost; pursue.

Write for someone else.

“How many books have you ghostwritten so far?”

Move like a ghost.

“The masked men ghosted across the moonlit yard”

A suggestion of some quality.

“he detected a ghost of a smile on her face”

A mental representation of some haunting experience.

“he looked like he had seen a ghost”

A writer who gives the credit of authorship to someone else.

The visible disembodied soul of a dead person.