penillion vs poetry

penillion

noun
  • The art of vocal improvisation, with a singer or small choir singing a countermelody over a harp melody; it is an important competition in eisteddfodau. 

poetry

noun
  • Literature composed in verse or language exhibiting conscious attention to patterns and rhythm. 

  • A poet's literary production. 

  • An artistic quality that appeals to or evokes the emotions, in any medium; something having such a quality. 

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