buster vs cobber

buster

noun
  • A molting crab. 

  • A cheat's die whose sides bear only certain combinations of spots, so that undesirable values can never be rolled. 

  • Forming compounds denoting a team, weapon, or device specialized in the destruction of the first element. 

  • A heavy fall; (also performing arts) a staged fall, a pratfall. 

  • Someone who or something that bursts, breaks, or destroys a specified thing. 

  • Forming compounds denoting an agent or agency tasked with reducing or eliminating the first element. 

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