excitation vs firing

excitation

noun
  • The act of exciting or putting in motion; the act of rousing up or awakening. 

  • The activity produced in an organ, tissue, or part, such as a nerve cell, as a result of stimulation 

  • The act of producing excitement (stimulation); also, the excitement produced. 

  • A transition of a nucleus, atom or molecule to an excited state by the absorption of a quantum of energy; the opposite of relaxation 

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. 

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