endurance vs impasse

endurance

noun
  • The length of time that a ship's rations will supply 

  • The measure of a person's stamina or persistence. 

  • Ability to endure hardship. 

impasse

noun
  • A road with no exit; a cul-de-sac. 

  • A deadlock or stalemate situation in which no progress can be made. 

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