capital ship vs man-of-war

capital ship

noun
  • Any of the most important types of warships, capable of projecting a fleet in being. 

man-of-war

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

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

  • The Arctic skua (Stercorarius parasiticus). 

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