hajduk vs water rat

hajduk

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

  • A halberdier of a Hungarian noble. 

  • An attendant in German or Hungarian courts. 

water rat

noun
  • A petty thief or waterfront ruffian. 

  • A member of the water police. 

  • The European water vole, Arvicola amphibius, formerly Arvicola terrestris. 

  • A water mouse, especially, the rakali, Hydromys chrysogaster. 

  • Any of various aquatic or semi-aquatic rodents from Florida and southern Georgia, especially Neofiber alleni; the muskrat. 

  • A person fond of water sports. 

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