cover-up vs distortion

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. 

distortion

noun
  • An act of distorting. 

  • An effect used in music, most commonly on guitars in rock or metal. 

  • A result of distorting. 

  • A misrepresentation of the truth. 

  • an aberration that causes magnification to change over the field of view. 

  • Noise or other artifacts caused in the electronic reproduction of sound or music. 

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