blessing vs rogation

blessing

noun
  • A prayer before a meal; grace. 

  • A pronouncement invoking divine aid. 

  • Good fortune. 

  • A modern pagan ceremony. 

  • Some kind of divine or supernatural aid, or reward. 

  • The act of declaring or bestowing favor; approval. 

  • A group of unicorns. 

  • Something someone is glad of. 

rogation

noun
  • A deeply serious and somber prayer or entreaty. 

  • The demand, by the consuls or tribunes, of a law to be passed by the people; a proposed law or decree. 

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