choir vs trill

choir

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

  • 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. 

verb
  • To sing in concert. 

trill

noun
  • A rapid alternation between an indicated note and the one above it, in musical notation usually indicated with the letters tr written above the staff. 

  • A type of consonantal sound that is produced by vibrations of the tongue against the place of articulation: for example, Spanish ⟨rr⟩, /r/. 

  • A tremulous high-pitched vocal sound produced by cats. 

verb
  • To impart the quality of a trill to; to utter as, or with, a trill. 

  • To create a trill sound; to utter trills or a trill; to play or sing in tremulous vibrations of sound; to have a trembling sound; to quaver. 

adj
  • true, respected 

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