palisade vs washboard

palisade

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

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

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

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

verb
  • To equip with a palisade. 

washboard

noun
  • A board with a corrugated surface against which laundry may be rubbed. 

  • A stretch of ripples or bumps on a dirt or gravel road caused by interaction between traffic and road surface. 

  • A board fastened along a ship's gunwale to prevent splashing; a splashboard. 

  • Such a board used as a simple percussion instrument. 

verb
  • To play a washboard. 

  • To move up and down or back and forth across the surface of a hive, possibly to lay down a layer of propolis and wax. 

  • To produce a rippled texture on a surface. 

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