congratulatory vs encomiastic

congratulatory

adj

  • Serving to congratulate. 

encomiastic

adj

  • Bestowing praise; eulogistic; laudatory. 

  • Of or relating to an encomiast. 

noun

  • A panegyric. 

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