fisher vs piscator

fisher

noun
  • The fur of Martes pennanti. 

  • A person who catches fish, especially for a living or for sport; a person engaging in the pastime of fishing. 

  • A North American marten, Martes pennanti, that has thick brown fur. 

piscator

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