canto vs stanza

canto

noun
  • One of the chief divisions of a long poem; a book. 

  • The treble or leading melody. 

  • The designated division of a song. 

stanza

noun
  • A unit of a poem, written or printed as a paragraph; equivalent to a verse. 

  • An XML element which acts as basic unit of meaning in XMPP. 

  • An apartment or division in a building. 

  • A segment; a portion of a broadcast devoted to a particular topic. 

  • A period; an interval into which a sporting event is divided. 

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