prayer vs psalmody

prayer

noun
  • One who prays. 

  • An act of praying. 

  • A practice of communicating with one's God, or with some spiritual entity. 

  • The specific words or methods used for praying. 

  • The remotest hope or chance. 

  • A meeting held for the express purpose of praying. 

  • A request; a petition. 

psalmody

noun
  • A collection of psalms. 

  • The singing or the writing of psalms. 

verb
  • To celebrate in psalms. 

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