octet vs sestet

octet

noun
  • A composition for such a group of musicians. 

  • A group or set of eight of something. 

  • A group of eight musicians performing together. 

  • A byte of eight bits. Abbreviation: o 

  • A group of three bits, representing any of eight possible values. 

sestet

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

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

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