sloop vs wherry

sloop

noun
  • A sailing warship, smaller than a frigate, with its guns all on one deck. 

  • A single-masted sailboat with only one headsail. 

  • A sloop-of-war, smaller than a frigate, larger than a corvette. 

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. 

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