earthenware vs tea service

earthenware

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

tea service

noun
  • a set of matching crockery for serving tea; normally a teapot, cups, saucers and small plates etc.; some items may be silver 

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