cover-up vs evasion

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. 

evasion

noun
  • The act of eluding or evading or avoiding, particularly the pressure of an argument, accusation, charge, or interrogation; artful means of eluding. 

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