Swan vs jitterbug

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. 

jitterbug

noun
  • An uptempo jazz or swing dance which embellishes on the two-step pattern and frequently incorporates acrobatic style swing steps. 

  • A jazz musician or aficionado. 

  • Synonym of diddley bow (“type of stringed instrument”) 

  • A nervous or jittery person. 

verb
  • To dance the jitterbug. 

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