devotion vs litany

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. 

litany

noun
  • A ritual liturgical prayer in which a series of prayers recited by a leader are alternated with responses from the congregation. 

  • A prolonged or tedious list. 

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