expire vs falsetto

expire

verb
  • To lapse and become invalid. 

  • To bring to a close; to terminate. 

  • To come to an end; to conclude. 

  • To die. 

  • To exhale; to breathe out. 

  • To give forth insensibly or gently, as a fluid or vapour; to emit in minute particles. 

falsetto

verb
  • To sing or utter in falsetto. 

noun
  • A person who sings in falsetto. 

  • 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. 

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