excitation vs incentive

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 

incentive

noun
  • Something that motivates, rouses, or encourages. 

  • A bonus or reward, often monetary, to work harder. 

adj
  • Inciting; encouraging or moving; rousing to action; stimulating. 

  • Serving to kindle or set on fire. 

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