The term 'Hercule's Creator' is referring to AGATHA, a 6 letter word. AGATHA Christie was an English writer who is best known for her detective novels and short stories. She is considered to be the best-selling novelist of all time and has written 66 detective novels and 14 short story collections. Her works have been adapted into plays, films, and television series. She is also credited with creating the characters of Hercule Poirot and Miss Marple.