ambiguity vs escape route

ambiguity

noun
  • The state of being ambiguous. 

  • words or statements that are open to more than one interpretation, explanation or meaning, especially if that meaning cannot be determined from its context. 

escape route

noun
  • A way out of a difficult or unpleasant situation. 

  • A path used by someone to escape from a dangerous place. 

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