cover-up vs excuse

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. 

excuse

noun
  • Explanation designed to avoid or alleviate guilt or negative judgment; a plea offered in extenuation of a fault. 

  • A defense to a criminal or civil charge wherein the accused party admits to doing acts for which legal consequences would normally be appropriate, but asserts that special circumstances relieve that party of culpability for having done those acts. 

  • An example of something that is substandard or of inferior quality. 

verb
  • To provide an excuse for; to explain, with the aim of alleviating guilt or negative judgement. 

  • To forgive; to pardon. 

  • To relieve of an imputation by apology or defense; to make apology for as not seriously evil; to ask pardon or indulgence for. 

  • To allow to leave, or release from any obligation. 

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