delegacy vs envoy

delegacy

noun
  • A collection of delegates. 

  • The position or state of being a delegate. 

envoy

noun
  • A representative. 

  • A messenger. 

  • A diplomat. 

  • A diplomatic agent of the second rank, next in status after an ambassador. 

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