cobber vs marrow

cobber

noun
  • A pal, buddy, mate, friend; often used in direct address by one male to another. 

  • A sweet consisting of a small block of hard caramel covered in chocolate. 

marrow

noun
  • A friend, pal, buddy, mate. 

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

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