discord vs vendetta

discord

noun
  • Tension or strife resulting from a lack of agreement; dissension. 

  • Any harsh noise, or confused mingling of sounds. 

  • An inharmonious combination of simultaneously sounded tones; a dissonance. 

  • Lack of concord, agreement or harmony. 

verb
  • To untie things which are connected by a cord. 

vendetta

noun
  • A bitter, destructive feud, normally between two families, clans, or factions, in which each injury or slaying is revenged: a blood feud. 

  • Revenge. 

  • A motivational grudge against a person or faction, which may or may not be reciprocated; the state of having it in for someone. 

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