falsetto vs find fault

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. 

find fault

verb
  • (followed by with) To criticize (something) excessively 

  • To criticize excessively 

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