hajduk vs invader

hajduk

noun
  • An outlaw, highwayman, or freedom fighter in the Balkans. 

  • A halberdier of a Hungarian noble. 

  • An attendant in German or Hungarian courts. 

invader

noun
  • One who invades a region 

  • An intruder (especially on someone's privacy) 

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