falsetto vs peep

falsetto

noun
  • 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. 

  • A person who sings in falsetto. 

verb
  • To sing or utter in falsetto. 

peep

noun
  • A short, soft, high-pitched sound, as made by a baby bird. 

  • The sound of a steam engine's whistle; typically shrill. 

  • A quick look or glimpse, especially a furtive one. 

  • A feeble utterance or complaint. 

  • A sandpiper or other small wader. 

  • The first partial appearance of something; a beginning to appear. 

  • person. 

verb
  • To look, especially through a narrow opening, or while trying not to be seen or noticed. 

  • To speak briefly with a quiet voice. 

  • To make a soft, shrill noise like a baby bird. 

  • To begin to appear; to look forth from concealment; to make the first appearance. 

  • To take a look at; check out. 

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