coracle vs dugout

coracle

noun
  • A small circular or oblong boat made of wickerwork and made watertight with hides or pitch, propelled and steered with a single paddle and light enough to be carried on a person's back. 

dugout

noun
  • A canoe made from a hollowed-out log. 

  • A pit dug into the ground as a shelter, especially from enemy fire. 

  • A sunken shelter at the side of a baseball or football (soccer) field where non-playing team members and staff sit during a game. 

  • A small portable case for equipment used to smoke marijuana. 

  • A pit used to catch and store rainwater or runoff. 

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