hymnal vs psalmody

hymnal

noun
  • A collection of hymns; a hymn book. 

adj
  • Of or pertaining to hymns. 

psalmody

noun
  • A collection of psalms. 

  • The singing or the writing of psalms. 

verb
  • To celebrate in psalms. 

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