headpiece vs top hat

headpiece

noun
  • The top piece or part of various things. 

  • A headstall. 

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

  • A headset. 

  • Something covering the head. 

  • Protecting cover for the head; a helmet. 

  • The head; the brain. 

top hat

noun
  • A kind of steel batten. 

  • A man's formal hat, with a tall cylindrical crown (often of silk). 

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