clatter vs falsetto

clatter

verb
  • To chatter noisily or rapidly. 

  • To hit; to smack. 

  • To make a rattling sound. 

noun
  • A rattling noise; a repetition of abrupt, sharp sounds. 

  • A loud disturbance. 

  • Noisy talk or chatter. 

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