cenotaph vs masterpiece

cenotaph

noun
  • A monument, generally in the form of an empty tomb, erected to honour the dead whose bodies lie elsewhere, especially members of the armed forces who died in battle. 

masterpiece

noun
  • A work created in order to qualify as a master craftsman and member of a guild. 

  • A piece of work that has been given much critical praise, especially one that is considered the greatest work of a person's career. 

  • A work of outstanding creativity, skill or workmanship. 

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