ceramic vs earthenware

ceramic

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

  • An object made of this material 

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

earthenware

noun
  • An opaque, semi-porous ceramic made from clay and other compounds. 

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