adherence vs adhesion

adherence

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

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

  • Faithful support for some cause. 

  • A close physical union of two objects. 

adhesion

noun
  • An agreement to adhere. 

  • An abnormal union of surface by the formation of new tissue resulting from an inflammatory process. 

  • Persistent attachment or loyalty. 

  • The ability of a substance to stick to an unlike substance. 

  • The binding of a cell to a surface or substrate. 

  • The frictional grip on a surface, of wheels, shoes etc. 

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