Mac vs cobber

Mac

noun
  • A Macintosh computer (made by Apple Inc.). 

  • Used to address a man whose name is unknown. 

name
  • McMaster University 

  • A diminutive for a person with a surname that starts with "Mac" or "Mc". 

  • A diminutive of the male given name Max. 

prefix
  • son of. 

cobber

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

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

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