buzz vs falsetto

buzz

verb
  • To utter a murmuring sound; to speak with a low, humming voice. 

  • To fly while making such a sound. 

  • To show a high level of activity and haste, energization or excitement, to be busy as a bee in one’s actions but perhaps mentally charged. 

  • Of a group of people, to talk about some interesting topic excitedly. 

  • To whisper; to communicate, as tales, in an undertone; to spread, as a report, by whispers or secretly. 

  • To make a low, continuous, humming or sibilant sound, like that made by bees with their wings. 

  • To fly at high speed and at a very low altitude over a specified area, as to make a surprise pass. 

  • To talk to incessantly or confidentially in a low humming voice. 

  • To cut the hair in a close-cropped military style, or buzzcut. 

  • To communicate with (a person) by means of a buzzer. 

noun
  • Major topic of conversation; widespread rumor; information spread behind the scenes. 

  • Synonym of fizz-buzz (“counting game”) 

  • The audible friction of voiced consonants. 

  • A whisper. 

  • A rush or feeling of energy or excitement; a feeling of slight intoxication. 

  • A continuous humming noise, as of bees; a confused murmur, as of general conversation in low tones. 

  • A telephone call or e-mail. 

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