memorial vs undercroft

memorial

noun
  • Something, such as a monument, by which someone or something is remembered. 

  • A chronicle or memoir. 

  • A service of remembrance or commemoration. 

  • A statement of facts set out in the form of a petition to a person in authority, a court or tribunal, a government, etc. 

adj
  • Serving as a remembrance of someone or something; commemorative. 

  • Contained in the memory. 

undercroft

noun
  • A cellar or vaulted storage room. 

  • A ground-level car park that occupies the base of a building. 

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