cover-up vs showing

cover-up

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

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

showing

noun
  • An occasion when something is shown. 

  • A result, a judgement. 

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