brig vs stalag

brig

noun
  • A jail or guardhouse, especially in a naval military prison or jail on a ship, navy base, or (in fiction) spacecraft. 

  • A two-masted vessel, square-rigged on both foremast and mainmast 

  • Bridge. 

  • Brigadier. 

stalag

noun
  • A German prisoner-of-war camp, especially in World War II. 

  • A genre of Nazi exploitation Holocaust pornography in Israel that flourished in the 1950s and early 1960s. 

How often have the words brig and stalag occurred in a corpus of books? (source: Google Ngram Viewer )