commendation vs rancor

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. 

rancor

noun
  • A feeling of long-lasting ire for another, sometimes to the point of hatred, over a perceived wrongdoing; bitterness. 

  • Rancidity, rankness. 

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