anger vs roil

anger

verb
  • To become angry. 

  • To cause such a feeling of antagonism in. 

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. 

roil

verb
  • To annoy; to make angry; to throw into discord. 

  • To romp. 

  • To render turbid by stirring up the dregs or sediment of. 

  • To bubble, seethe. 

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