antiphon vs psalmody

antiphon

noun
  • A devotional piece of music sung responsively. 

  • A response or reply. 

psalmody

noun
  • The singing or the writing of psalms. 

  • A collection of psalms. 

verb
  • To celebrate in psalms. 

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