bo vs cobber

bo

noun
  • Fellow, chap, boy. 

  • A quarterstaff, especially in an oriental context. 

intj
  • An exclamation used to startle or frighten. 

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