crusader vs reformer

crusader

noun
  • the crusaders of the Middle Ages 

  • An American, especially a soldier or leader who wages war against Islamist militants. 

  • A Westerner; a Christian, especially of European descent or a missionary. 

  • A fighter in the medieval Crusades who had taken the Cross. 

  • A person engaged in a crusade. 

  • (either attributively or in the plural) The United States and its Western allies. 

reformer

noun
  • One who was involved in the Reformation. 

  • One who reforms, or who works for reform. 

  • A device used to convert petroleum refinery naphthas, typically having low octane ratings, into high-octane liquid products called reformates. 

  • A device which converts hydrocarbons into a hydrogen-rich mixture of gases. 

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