icehouse vs stockade

icehouse

noun
  • A deep cellar or outdoor building used for the storage of ice or snow; sometimes also used to store food at low temperature. 

  • An ice hockey rink. 

  • A cold state in global climate. 

stockade

noun
  • an enclosure protected by a wall of wooden posts 

  • a military prison 

verb
  • To enclose in a stockade. 

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