muckrake vs whistle-stop

muckrake

verb
  • To search for and expose corruption or scandal, especially as a form of investigative journalism. 

noun
  • A rake for scraping up dung. 

whistle-stop

noun
  • A small train station. 

  • A brief stop on a campaign tour to make a speech or perform some other type of public electioneering. 

verb
  • To make a brief stop on a campaign tour to make a speech or perform some other type of public electioneering. 

adj
  • Extremely brief and hurried. 

How often have the words muckrake and whistle-stop occurred in a corpus of books? (source: Google Ngram Viewer )