entanglement vs warren

entanglement

noun
  • An obstruction placed in front or on the flank of a fortification, to impede an enemy's approach. 

  • An obstruction of cables and spars across a river or harbour entrance. 

  • The condition of being deeply involved and intricated (with politics, a group, another person, etc.) 

  • The condition, or an instance, of being romantically or sexually involved with another person; an affair. 

  • The act of entangling. 

warren

noun
  • 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. 

  • The system of burrows where rabbits live. 

  • 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 entanglement and warren occurred in a corpus of books? (source: Google Ngram Viewer )