battleship vs man-of-war

battleship

noun
  • A large capital warship displacing thousands to tens of thousands of tons, heavily armoured and armed with large-caliber guns; now obsolescent and replaced by smaller vessels with guided missiles. 

  • A guessing game played on grid paper; see Battleship (game). 

  • A non-functional rocket stage, used for configuration and integration tests. 

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 battleship and man-of-war occurred in a corpus of books? (source: Google Ngram Viewer )