auteur vs showman

auteur

noun
  • A creative artist, especially a film director, seen as having a specific, recognisable artistic vision, and who is seen as the single or preeminent ‘author’ of his works. 

showman

noun
  • A person skilled in dramatic or entertaining presentation, performance, or publicity. 

  • A person who produces or presents shows as a profession, especially the proprietor, manager, or MC of a circus or variety show. 

How often have the words auteur and showman occurred in a corpus of books? (source: Google Ngram Viewer )