firing vs slipware

firing

noun
  • The process of applying heat or fire, especially to clay, etc., to produce pottery. 

  • Cauterization. 

  • The dismissal of someone from a job. 

  • The fuel for a fire. 

  • The discharge of a gun or other weapon. 

  • The act of adding fuel to a fire. 

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 firing and slipware occurred in a corpus of books? (source: Google Ngram Viewer )