firing vs stained glass

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. 

stained glass

noun
  • Glass that has been coloured, either by painting or by fusing pigments into its structure. 

  • The use of such glass to construct decorative windows, especially in churches. 

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