forest ranger vs lumberjack

forest ranger

noun
  • A person entrusted with protecting and preserving public forested land. 

lumberjack

noun
  • A person whose work is to fell trees. 

  • A lumberjacket. 

verb
  • To work as a lumberjack, cutting down trees. 

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