epitaph vs saying

epitaph

noun
  • A poem or other short text written in memory of a deceased person. 

  • An inscription on a gravestone in memory of the deceased. 

verb
  • To write or speak after the manner of an epitaph. 

  • To commemorate by an epitaph. 

saying

noun
  • A proverb or maxim. 

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