enlightened vs let-down

enlightened

noun
  • Someone who has been introduced to the mysteries of some activity, religion especially Buddhism 

adj
  • Exceedingly wise. 

  • Made aware of something. 

  • Freed from illusion. 

  • Educated or informed. 

let-down

noun
  • A disappointment or anticlimax. 

  • The clearance of an aircraft to descend through clouds to clear air below, or the process of granting such a clearance. 

  • The neurohormonal release of milk in dairy cows or in breastfeeding human mothers. 

How often have the words enlightened and let-down occurred in a corpus of books? (source: Google Ngram Viewer )