pottery vs slipware

pottery

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

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

  • Fired ceramic wares that contain clay when formed. 

slipware

noun
  • A type of pottery identified by its primary decorating process where slip is placed onto the dry surface by dipping, painting or splashing. 

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