Argonaut vs crusader

Argonaut

name
  • One of the members of the Argo who sailed with Jason in search of the Golden Fleece. 

  • A team member for the Toronto Argonauts of the Canadian Football League. 

  • Any of several ships and submarines of the British and US navies. 

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 Argonaut and crusader occurred in a corpus of books? (source: Google Ngram Viewer )