cluck vs falsetto

cluck

verb
  • To make such a sound. 

  • To cause (the tongue) to make a clicking sound. 

  • To call together, or call to follow, as a hen does her chickens. 

  • to suffer withdrawal from heroin. 

noun
  • The sound made by a hen, especially when brooding, or calling her chicks. 

  • A kind of tongue click used to urge on a horse. 

  • Any sound similar to this. 

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