cistern vs pottery

cistern

noun
  • A cisterna. 

  • The vessel surrounding the condenser in a steam engine. 

  • In a flush toilet, the container in which the water used for flushing is held; a toilet tank. 

  • A reservoir or tank for holding water, especially for catching and holding rainwater for later use. 

pottery

noun
  • The potter's craft or art: making vessels from clay. 

  • Fired ceramic wares that contain clay when formed. 

  • A potter's shop or workshop, where pottery is made. 

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