friction vs opposition

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. 

opposition

noun
  • The action of opposing or of being in conflict. 

  • The difference of quantity or quality between two propositions having the same subject and predicate. 

  • A political party or movement opposed to the party or government in power. 

  • In United States intellectual property law, a proceeding in which an interested party seeks to prevent the registration of a trademark or patent. 

  • The apparent relative position of two celestial bodies when one is at an angle of 180 degrees from the other as seen from the Earth. 

  • An opposite or contrasting position. 

  • A position in which the player on the move must yield with his king allowing his opponent to advance with his own king. 

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