man-of-war vs skua

man-of-war

noun
  • The Arctic skua (Stercorarius parasiticus). 

  • A man whose occupation is fighting in wars; a soldier, a warrior. 

  • A powerful armed naval vessel, primarily one armed with cannon and propelled by sails; a warship. 

skua

noun
  • Any of various predatory seabirds of the family Stercorariidae that often chase other seabirds to steal their catches. 

How often have the words man-of-war and skua occurred in a corpus of books? (source: Google Ngram Viewer )