Bluff vs Bogan

Bluff

name
  • A town in New Zealand, the southernmost in the South Island, and seaport for the Southland region. 

Bogan

name
  • A river of central to northern New South Wales, Australia, a tributary to the Darling. 

  • A surname from Irish. 

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