rube vs yokel

rube

noun
  • An uninformed, unsophisticated, or unintelligent person. 

  • A person of rural heritage; a yokel. 

yokel

noun
  • A person from or living in the countryside, viewed as being unsophisticated and/or naive. 

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