anger vs indignation

anger

noun
  • A strong feeling of displeasure, hostility or antagonism towards someone or something, usually combined with an urge to harm, often stemming from perceived provocation, hurt, or threat. 

verb
  • To become angry. 

  • To cause such a feeling of antagonism in. 

indignation

noun
  • An anger aroused by something perceived as an indignity, notably an offense or injustice. 

  • A self-righteous anger or disgust. 

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