improvement vs revival

improvement

noun
  • The act of improving; advancement or growth; a bettering 

  • Increase; growth; progress; advance. 

  • Something which is improved 

  • Valuable additions or betterments, for example buildings, clearings, drains, fences, etc., on premises. 

  • A useful addition to, or modification of, a machine, manufacture, or composition. 

  • The state of being improved; betterment; advance 

  • The act of making profitable use or application of anything, or the state of being profitably employed; practical application, for example of a doctrine, principle, or theory, stated in a discourse. 

revival

noun
  • Renewed interest, performance, cultivation, or flourishing state of something, as of culture, commerce, agriculture. 

  • Reanimation from a state of languor or depression; applied to health, a person's spirits, etc. 

  • Renewed interest in religion, after indifference and decline; a period of religious awakening; special religious interest. 

  • Renewed prevalence of something, as a practice or a fashion. 

  • A Christian religious meeting held to inspire active members of a church body or to gain new converts. 

  • Restoration of force, validity, or effect; renewal; reinstatement of a legal action. 

  • The act of reviving, or the state of being revived. 

  • Revivification, as of a metal. 

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