litany vs repetitiousness

litany

noun
  • A prolonged or tedious list. 

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

repetitiousness

noun
  • The state of being repetitious. 

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