Observant vs religious

Observant

noun
  • A member of a Franciscan order that strictly observes the rules of St. Francis. 

religious

noun
  • A member of a religious order, i.e. a monk or nun. 

adj
  • Concerning religion. 

  • Committed to the practice or adherence of religion. 

  • Highly dedicated, as one would be to a religion. 

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