Observant vs reverend

Observant

noun

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

reverend

noun

  • A member of the Christian clergy; a minister. 

adj

  • worthy of reverence or respect 

  • reverent 

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