Swan vs fettler

Swan

noun
  • someone connected with Swansea City Football Club, as a fan, player, coach, etc. 

  • someone connected with the Sydney Swans, as a fan, player, coach, etc. 

name
  • A surname transferred from the nickname. 

fettler

noun
  • A person who maintains railway lines. 

  • Someone who fiddles or tinkers with things. 

  • A friend or mate 

  • An ostler; one who looks after the horses in a mine. 

  • Someone whose job is to sand and grind small imperfections from metal and ceramic castings. 

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