poem vs poetry

poem

noun
  • A piece of writing in the tradition of poetry, an instance of poetry. 

  • A piece of poetic writing, that is with an intensity or depth of expression or inspiration greater than is usual in prose. 

  • A literary piece written in verse. 

poetry

noun
  • A poet's literary production. 

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

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

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