showman vs singer

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. 

singer

noun
  • A person who sings, often professionally. 

  • A machine for singeing cloth. 

  • A person who, or device which, singes. 

  • dance figure with a fixed structure, sung by a caller, or a piece of music with that structure. 

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