commendation vs rating

commendation

noun
  • The act of commending; praise; favorable representation in words; recommendation. 

  • That which is the ground of approbation or praise. 

  • A message of affection or respect; compliments; greeting. 

  • An award or recognition for performance; a medal. 

rating

noun
  • An enlisted seaman not a commissioned officer or warrant officer. 

  • An evaluation of status, especially of financial status. 

  • A number, letter, or other mark that refers to the ability of something. 

  • A position on a scale. 

  • A quantitative measure of the audience of a television program. 

  • A seaman in a warship. 

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