man-of-war vs man-of-war bird

man-of-war

noun
  • 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. 

  • The Arctic skua (Stercorarius parasiticus). 

man-of-war bird

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