choir vs trio

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. 

trio

noun
  • A group of three musicians. 

  • A piece of music written for three musicians. 

  • A group of three people or things. 

  • Any cocktail made with a spirit, a liqueur, and a creamy ingredient. 

  • A passage in the middle of a minuet, frequently in a different key. 

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