Swan vs marrow

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. 

marrow

noun
  • The inner meaning or purpose. 

  • The pith of certain plants. 

  • Bone marrow biopsy. 

  • The essence; the best part. 

  • The substance inside bones which produces blood cells. 

  • A friend, pal, buddy, mate. 

  • A kind of vegetable like a large courgette/zucchini or squash. 

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