ceramic vs porcelainware

ceramic

noun
  • An object made of this material 

  • A hard, brittle, inorganic, nonmetallic material, usually made from a material, such as clay, then firing it at a high tempature. 

adj
  • Made of material produced by the high-temperature firing of inorganic, nonmetallic rocks and minerals. 

porcelainware

noun
  • Items made from porcelain. 

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