charva vs cobber

charva

noun
  • Friend; mate. 

  • Unruly youth; disobedient child or teenager. 

  • A chav. 

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