wherry vs yacht

wherry

noun
  • A light ship used to navigate inland waterways. 

  • A flat-bottomed vessel once employed by British merchants, notably in East Anglia, sometimes converted into pleasure boats. 

  • A liquor made from the pulp of crab apples after the verjuice is extracted. 

yacht

noun
  • A slick and light ship for making pleasure trips or racing on water, having sails but often motor-powered. At times used as a residence offshore on a dock. 

  • Any vessel used for private, noncommercial purposes. 

verb
  • To sail, voyage, or race in a yacht. 

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