freeboard vs palisade

freeboard

noun
  • The distance between a water level and the top of something that contains or restrains it (such as a dam). 

  • The distance between the top of sea ice and the water level. 

  • A type of skateboard which simulates the movement of a snowboard when used on a downhill coarse, allowing snowboarding techniques, which has an addition of two centerline casters that extend below the traditional skateboard wheels and bogies. 

  • The vertical distance between the waterline and the uppermost watertight deck of a vessel. 

palisade

noun
  • A long, strong stake, one end of which is set firmly in the ground, and the other sharpened. 

  • An even row of cells. e.g.: palisade mesophyll cells. 

  • A line of cliffs, especially one showing basaltic columns. 

  • A wall of wooden stakes, used as a defensive barrier. 

verb
  • To equip with a palisade. 

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