Captain vs fisherman

Captain

noun
  • The title for someone who holds the captain job on a ship or other vessel. 

  • An army officer title in most countries 

fisherman

noun
  • A vessel (boat or ship) used for fishing. 

  • Any person who attempts to catch fish. 

  • A person whose profession is catching fish. 

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