choir vs lullaby

choir

verb
  • To sing in concert. 

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. 

lullaby

verb
  • To sing a lullaby to. 

noun
  • A cradlesong, a soothing song to calm children or lull them to sleep. 

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