evangel vs psalm

evangel

noun
  • The Christian gospel. 

  • A salutary principle relating to morals, politics, etc. 

  • An evangelist. 

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