cover-up vs guise

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. 

guise

noun
  • Misleading appearance; cover, cloak. 

  • External appearance in manner or dress; appropriate indication or expression; garb; shape. 

  • Customary way of speaking or acting; fashion, manner, practice (often used formerly in such phrases as "at his own guise"; that is, in his own fashion, to suit himself.) 

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