bowler vs headpiece

bowler

noun
  • A bowler hat; a round black hat formerly popular among British businessmen. 

  • One who engages in the sport of bowling. 

  • The pitcher. 

  • A player selected mainly for his bowling ability. 

  • The player currently bowling. 

headpiece

noun
  • Something covering the head. 

  • A headstall. 

  • A decorative page heading used at the start of volumes or chapters. 

  • A headset. 

  • The top piece or part of various things. 

  • Protecting cover for the head; a helmet. 

  • The head; the brain. 

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