Observant vs esoteric

Observant

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

esoteric

noun
  • One who believes, or is an initiate, in esoteric doctrines or rites. 

  • An esoteric doctrine or treatise; esoteric philosophy. 

adj
  • Having to do with concepts that are highly theoretical and without obvious practical application; often with mystical or religious connotations. 

  • Confidential; private. 

  • Intended for or likely to be understood by only a small number of people with a specialized knowledge or interest, or an enlightened inner circle. 

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