falsetto vs vocalize

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. 

vocalize

verb
  • To express with the voice, to utter. 

  • To sing without using words. 

  • To produce noises or calls from the throat. 

  • To add vowel points to a consonantal script (e.g. niqqud in Hebrew) 

  • To turn a consonant into a vowel. 

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