devotion vs rogation

devotion

noun
  • A prayer (often found in the plural) 

  • The act or state of devoting or being devoted. 

  • Feeling of strong or fervent affection; dedication 

  • Religious veneration, zeal, or piety. 

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