derail vs stymie

derail

verb
  • To cause to deviate from a set course or direction. 

  • To cause to come off the tracks. 

  • To come off the tracks. 

  • To deviate from the previous course or direction. 

noun
  • An instance of diverting a conversation or debate from its original topic. 

  • Synonym of derailer: A device placed on railway tracks in order to cause a train to derail. 

stymie

verb
  • To thwart or stump; to cause to fail or to leave hopelessly puzzled, confused, or stuck. 

  • To bring into the position of, or impede by, a stymie. 

noun
  • A situation where an opponent's ball is directly in the way of one's own ball and the hole, on the putting green (abolished 1952). 

  • An obstacle or obstruction. 

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