deprecation vs rogation

deprecation

noun
  • A praying against evil; prayer that an evil may be removed or prevented; strong expression of disapprobation. 

  • The act of deprecating. 

  • Entreaty for pardon; petitioning. 

  • An imprecation or curse. 

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