pericope vs psalm

pericope

noun
  • A passage of Scripture to be read in public worship or a book containing such passages. 

  • A section of text forming a coherent thought, suitable for use in a speech. 

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 pericope and psalm occurred in a corpus of books? (source: Google Ngram Viewer )