brig vs dory

brig

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

  • Bridge. 

  • Brigadier. 

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

dory

noun
  • A small flat-bottomed boat with pointed or somewhat pointed ends, used for fishing both offshore and on rivers. 

  • Any of several different families of large-eyed, silvery, deep-bodied, laterally compressed, and roughly discoid marine fish. 

  • A wooden pike or spear about three metres (ten feet) in length with a flat, leaf-shaped iron spearhead and a bronze butt-spike (called a sauroter), which was the main weapon of hoplites in Ancient Greece. It was usually not thrown but rather thrust at opponents with one hand. 

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