battler vs crusader

battler

noun
  • One who wages battle against an enemy; a soldier; a general. 

  • One who works hard in the face of adversity. 

crusader

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

  • the crusaders of the Middle Ages 

  • 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. 

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