litany vs reiteration

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. 

reiteration

noun
  • The act of reiterating. 

  • Something reiterated or restated. 

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