appreciation vs recognition

appreciation

noun
  • Accurate perception; true estimation. 

  • A rise in value. 

  • The act of appreciating. 

  • A fair valuation or estimate of merit, worth, weight, etc.; recognition of excellence; gratitude and esteem. 

recognition

noun
  • The act of recognizing or the condition of being recognized (matching a current observation with a memory of a prior observation of the same entity). 

  • Acceptance as valid or true. 

  • Honour, favourable note, or attention. 

  • A return of the feu to the superior. 

  • Official acceptance of the status of a new government by that of another country. 

  • The propriety consisting for antibodies to bind to some specific antigens and not to others. 

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