hyperbole vs litotes

hyperbole

noun
  • An instance or example of such overstatement. 

  • Deliberate or unintentional overstatement, particularly extreme overstatement. 

litotes

noun
  • An ironic figure of speech whereby something is stated by denying its opposite, particularly the negation of a negative quality to say something positive. 

How often have the words hyperbole and litotes occurred in a corpus of books? (source: Google Ngram Viewer )