Swan vs butty

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. 

butty

noun
  • 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. 

  • Friend. 

  • A workmate. 

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