discord vs friction

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. 

friction

noun
  • Conflict, as between persons having dissimilar ideas or interests; clash. 

  • The rubbing of one object or surface against another. 

  • A force that resists the relative motion or tendency to such motion of two bodies in contact. 

  • (Second Sino-Japanese War) Conflict, as between the Communists and non-Hanjian Kuomintang forces. 

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