epitaph vs tombstone

epitaph

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

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

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

  • To commemorate by an epitaph. 

tombstone

noun
  • A headstone marking a person's grave. 

  • The symbol "∎" marking the end of a proof. 

  • A crashdump. 

  • A marker that takes the place of deleted data, allowing for replication of the deletion across servers etc. 

  • An unusual morphological feature on an electrocardiogram indicative of acute myocardial infarction, characterized by a massive ST elevation. 

  • A printed advertisement in a newspaper or magazine, typically having unadorned centered text in black and white, enclosed in a simple box. 

verb
  • For a surfboard to stand upright half-submerged in the water (like a tombstone, above) because the surfer is underwater with his or her legrope pulled tight. Often this indicates a surfer in difficulty, either held down by the power of a wave or unconscious and unable to get to the surface. 

  • To replace (an object or data) with a tombstone marker. 

  • To take part in tombstoning: to jump into the sea, etc. from a cliff or other high point so as to enter the water vertically straight. 

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