choir vs octet

choir

noun
  • A group of people who sing together; a company of people who are trained to sing together. 

  • The part of a church where the choir assembles for song. 

  • One of the nine ranks or orders of angels. 

  • Set of strings (one per note) for a harpsichord. 

verb
  • To sing in concert. 

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. 

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