quarterdeck vs tafferel

quarterdeck

noun
  • The aft part of the upper deck of a ship; normally reserved for officers 

tafferel

noun
  • The flat upper part of a ship's stern above the transom, often decorated with carvings. 

  • The taffrail. 

  • A carved panel. 

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