psalmody vs requiem

psalmody

noun
  • The singing or the writing of psalms. 

  • A collection of psalms. 

verb
  • To celebrate in psalms. 

requiem

noun
  • A musical composition for such a mass. 

  • A large or dangerous shark, specifically, (zoology) a member of the family Carcharhinidae. 

  • A piece of music composed to honor a dead person. 

  • A mass (especially Catholic) to honor and remember a dead person. 

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