Observant vs faithful

Observant

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

faithful

noun
  • Someone or something that is faithful or reliable. 

  • The practicing members of a religion or followers of a cause. 

adj
  • Consistent with reality. 

  • Reliable; worthy of trust. 

  • Loyal; adhering firmly to person or cause. 

  • Injective in specific contexts, e.g. of representations in representation or functors in category theory. 

  • Engaging in sexual relations only with one's spouse or long-term sexual partner. 

  • Having faith. 

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