miserere vs psalm

miserere

noun
  • An expression of lamentation or complaint. 

  • A small projecting boss or bracket on the underside of the hinged seat of a church stall, intended to give some support to a standing worshipper when the seat is turned up; a misericord. 

  • Ileus. 

  • A medieval dagger, used for the mercy stroke to a wounded foe; misericord. 

psalm

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

  • 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. 

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

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