cover-up vs uncovering

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. 

uncovering

noun
  • The act by which something is uncovered. 

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