braddah vs cobber

braddah

noun
  • male friend 

  • brother 

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. 

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