couplet vs poetry

couplet

noun
  • A pair of lines, typically with rhyming end words. 

  • A pair of one-way streets which carry opposing directions of traffic through gridded urban areas. 

  • A pair of two mutually exclusive choices in a dichotomous key. 

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 couplet and poetry occurred in a corpus of books? (source: Google Ngram Viewer )