discord vs rift

discord

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

noun
  • Any harsh noise, or confused mingling of sounds. 

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

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

  • Lack of concord, agreement or harmony. 

rift

verb
  • To form a rift; to split open. 

  • To belch. 

  • To cleave; to rive; to split. 

noun
  • A break in the clouds, fog, mist etc., which allows light through. 

  • A chasm or fissure. 

  • A shallow place in a stream; a ford. 

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