dugout vs warren

dugout

noun
  • 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 canoe made from a hollowed-out log. 

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

warren

noun
  • The system of burrows where rabbits live. 

  • The right to maintain and hunt an area of small beasts, similar to a free warren, but with certain limitations, such as restricting the right to hunt on parts of the land held by freeholders. 

  • A mazelike place of passages and/or rooms in which it's easy to lose oneself; especially one that may be overcrowded. 

  • A place legally authorized for the keeping, breeding and hunting of beasts of warren, especially rabbits. 

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