mastaba vs undercroft

mastaba

noun
  • A wide stone bench built into the wall of a house, shop etc. in the Middle East. 

  • A rectangular structure with a flat top and slightly sloping sides, built during Ancient Egyptian times above tombs that were situated on flat land. Mastabas were made of wood, mud bricks, stone, or a combination of these materials. Some are solid structures, while others can contain one or more rooms, sometimes decorated with paintings or inscriptions. 

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 mastaba and undercroft occurred in a corpus of books? (source: Google Ngram Viewer )