akhi vs cobber

akhi

noun
  • Brother; a close male friend or associate. 

  • A British Asian (usually of South Asian descent). 

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 akhi and cobber occurred in a corpus of books? (source: Google Ngram Viewer )