Swan vs avocation

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. 

avocation

noun
  • The calling of a case from an inferior to a superior court. 

  • That which calls one away from one's regular employment or vocation. 

  • Pursuits; duties; affairs which occupy one's time; usual employment; vocation. 

  • A hobby or recreational or leisure pursuit. 

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