breath vs falsetto

breath

noun
  • The act or process of breathing. 

  • A single act of breathing in or out; a breathing of air. 

  • Air expelled from the lungs. 

  • A rest or pause. 

  • A small amount of something, such as wind, or common sense. 

adj
  • voiceless, surd; contrasting with voice (breath sounds, voice sounds) 

falsetto

noun
  • The "false" (singing) voice in any human, usually airy and lacking a purity of vowels; created by utilizing the next highest vocal folds above those used for speech and normal range singing. It is commonly confused with the head voice register. 

  • A person who sings in falsetto. 

verb
  • To sing or utter in falsetto. 

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