ambiguity vs sure thing

ambiguity

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

  • The state of being ambiguous. 

sure thing

intj
  • An affirmative reply; yes; certainly. 

  • A polite reply to thank you. 

noun
  • That which is certain. 

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