benediction vs rogation

benediction

noun
  • A short invocation for help, blessing and guidance from God, said on behalf of another person or persons (sometimes at the end of a church worship service). 

  • In the Anglican church, the ceremony used to institute an abbot, analogous to the consecration of a bishop. 

  • A Roman Catholic rite by which bells, banners, candles, etc., are blessed with holy water and formally dedicated to God. 

  • Help, good fortune or reward from God or another supernatural source. 

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 benediction and rogation occurred in a corpus of books? (source: Google Ngram Viewer )