disagreement vs severance

disagreement

noun
  • A condition of not agreeing or concurring. 

  • An argument or debate. 

severance

noun
  • The act of severing or the state of being severed. 

  • A separation. 

  • A severance payment. 

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