cover-up vs exposé

cover-up

noun
  • An attempt to conceal or disguise something, especially a wrongdoing or a mistake. 

  • An item of clothing to be worn over a swimsuit while not in the water. 

exposé

noun
  • The act of exposing somebody or something; a shameful showing up. 

  • A publication of investigative journalism that reveals hidden and often scandalous truths. 

  • A formal recital or exposition. 

How often have the words cover-up and exposé occurred in a corpus of books? (source: Google Ngram Viewer )