chafe vs falsetto

chafe

verb
  • To excite passion or anger in; to fret; to irritate. 

  • To have a feeling of vexation; to be vexed; to fret; to be irritated. 

  • To be worn by rubbing. 

  • To excite heat in by friction; to rub in order to stimulate and make warm. 

  • To fret and wear by rubbing. 

  • To rub; to come together so as to wear by rubbing; to wear by friction. 

noun
  • Injury or wear caused by friction. 

  • Vexation; irritation of mind; rage. 

  • Heat excited by friction. 

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 chafe and falsetto occurred in a corpus of books? (source: Google Ngram Viewer )