hymnody vs psalm

hymnody

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

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

psalm

noun
  • One of the hymns by David and others, collected into one book of the Old Testament, or a modern metrical version of such a hymn for public worship. 

  • A sacred song; a poetical composition for use in the praise or worship of God. 

verb
  • To extol in psalms; to make music; to sing 

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