ambiguity vs ambivalence

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. 

ambivalence

noun
  • A state of uncertainty or indecisiveness. 

  • The coexistence of opposing attitudes or feelings (such as love and hate) towards a person, object or idea. 

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