sestet vs sonnet

sestet

noun
  • The last six lines of a sonnet, forming two stanzas of three lines each. 

  • A piece of music composed for six voices or six instruments; a sextet or sestuor. 

sonnet

noun
  • A fixed verse form of Italian origin consisting of fourteen lines that are typically five-foot iambics and rhyme according to one of a few prescribed schemes. 

verb
  • To compose sonnets. 

  • To celebrate in sonnets; to write a sonnet about. 

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