hussar vs lancer

hussar

noun
  • A member of the light cavalry of any of several European armies. 

  • A member of the national cavalry of Hungary, Croatia and Poland. 

lancer

noun
  • A cavalry soldier armed with a lance weapon. 

  • Any of various Asian hesperiid butterflies of the genus Plastingia. 

  • One who lances something. 

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