ghostwriter

Etymology

ghost + writer

noun

1. A professional writer who is paid to write material that is officially credited to another person; one who writes on behalf of someone else, often for a celebrity.
   Ghostwriters, typically the faceless forces behind many books by famous non-writers, are now becoming more visible, with celebrities openly teaming up with high-profile professionals. April 13 2021, Cady Lang, “How Celebrity Memoirs Got So Good”, in Time
   Smith was listed as the author of his autobiography, but a ghostwriter did most of the work.