chanter vs vocalist

chanter

noun
  • One who chants or sings. 

  • The pipe of a bagpipe on which the melody is played. 

  • A priest who sings in a chantry. 

  • The hedge sparrow. 

vocalist

noun
  • A singer; a person who likes to sing. 

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