disillusion vs optimism

disillusion

noun
  • The act or process of disenchanting or freeing from a false belief. 

  • The state of having been or process of becoming freed of false belief. 

verb
  • To free or deprive of illusion; to disenchant. 

optimism

noun
  • the doctrine that this world is the best of all possible worlds 

  • a tendency to expect the best, or at least, a favourable outcome 

  • the belief that good will eventually triumph over evil 

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