adherence vs changeableness

adherence

noun
  • An extent to which a patient continues an agreed treatment plan. 

  • The fulfilment of the legal obligation of residing with wife or husband. 

  • Faithful support for some cause. 

  • A close physical union of two objects. 

changeableness

noun
  • the condition of being able to suffer some changes 

  • the condition of being changeable 

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