butty vs fettler

butty

noun
  • Friend. 

  • A miner who works under contract, receiving a fixed amount per ton of coal or ore. 

  • A sandwich, usually with a hot savoury filling in a breadcake. The most common are chips, bacon, sausage and egg. 

  • A workmate. 

fettler

noun
  • A friend or mate 

  • A person who maintains railway lines. 

  • Someone who fiddles or tinkers with things. 

  • 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 butty and fettler occurred in a corpus of books? (source: Google Ngram Viewer )