countermove vs differing

countermove

noun

  • A move in opposition or response to a preceding move. 

verb

  • To move in opposition or in retaliation. 

differing

noun

  • difference 

adj

  • unlike, dissimilar, distinct; that which differs 

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