adherence vs steadiness

adherence

noun
  • A close physical union of two objects. 

  • 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. 

steadiness

noun
  • the degree of stability 

  • the state of being steady 

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