enmity vs rancor

enmity

noun
  • A state or feeling of opposition, hostility, hatred or animosity. 

  • The quality of being an enemy; hostile or unfriendly disposition. 

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 enmity and rancor occurred in a corpus of books? (source: Google Ngram Viewer )