high-frequency vs soprano

high-frequency

adj
  • Of or pertaining to high frequency sound or other radiation. 

  • Occurring or doing something very frequently. 

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 high-frequency and soprano occurred in a corpus of books? (source: Google Ngram Viewer )