discord vs point of contention

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. 

point of contention

noun
  • A matter that forms the basis of a disagreement, struggle, etc. 

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