canticle vs psalmody

canticle

noun
  • A chant, hymn or song, especially a nonmetrical one, with words from a biblical text. 

psalmody

noun
  • The singing or the writing of psalms. 

  • A collection of psalms. 

verb
  • To celebrate in psalms. 

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