prayer vs rogation

prayer

noun
  • One who prays. 

  • An act of praying. 

  • A practice of communicating with one's God, or with some spiritual entity. 

  • The specific words or methods used for praying. 

  • The remotest hope or chance. 

  • A meeting held for the express purpose of praying. 

  • A request; a petition. 

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