changeableness vs fidelity

changeableness

noun
  • the condition of being able to suffer some changes 

  • the condition of being changeable 

fidelity

noun
  • Accuracy, or exact correspondence to some given quality or fact. 

  • Faithfulness to one's duties. 

  • Loyalty to one's spouse or partner, including abstention from cheating or extramarital affairs. 

  • The degree to which a system accurately reproduces an input. 

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