firing vs smouldering

firing

noun
  • The act of adding fuel to a fire. 

  • Cauterization. 

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

  • The dismissal of someone from a job. 

  • The fuel for a fire. 

  • The discharge of a gun or other weapon. 

smouldering

noun
  • The act by which something smoulders; residual heat. 

adj
  • Burning slowly, producing smoke but no flame. 

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