moan vs soprano

moan

verb
  • To make a moan or similar sound. 

  • To complain; to grumble. 

  • To say in a moan, or with a moaning voice. 

  • To grieve. 

noun
  • a low, mournful cry of pain, sorrow or pleasure 

soprano

verb
  • To sing or utter with high pitch. 

noun
  • Musical part or section higher in pitch than alto and other sections. 

  • Person or instrument that performs the soprano part. 

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