hymn vs hymnody

hymn

noun
  • A song of praise or worship, especially a religious one. 

verb
  • To praise or extol in hymns. 

  • To sing a hymn. 

hymnody

noun
  • The hymns of a particular church or of a particular time. 

  • The writing, composing, or singing of hymns or psalms. 

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