man-of-war vs ranker

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). 

ranker

noun
  • A common soldier. 

  • One who ranks things, or arranges them in ranks. 

  • A kind of soil developed over non-calcareous material, usually rock. 

  • One with a specified rank. 

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