adherence vs devotion

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. 

devotion

noun
  • The act or state of devoting or being devoted. 

  • Feeling of strong or fervent affection; dedication 

  • Religious veneration, zeal, or piety. 

  • A prayer (often found in the plural) 

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