kanaka vs roustabout

kanaka

noun
  • A South Pacific Islander, especially a labourer in Australia or Canada. 

  • A person of Hawaiian descent. 

roustabout

noun
  • an unskilled laborer, especially at an oilfield, at a circus or on a ship, 19th c. 

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