chorister vs nightingale

chorister

noun
  • A singer in a choir. 

  • A director or leader of a choral group. 

nightingale

noun
  • A Eurasian and African songbird, Luscinia megarhynchos, family Muscicapidae, famed for its beautiful singing at night; a common nightingale. 

  • A kind of flannel scarf with sleeves, formerly worn by invalids when sitting up in bed. 

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