beep vs birr

beep

verb
  • To sound (something that makes a beep). 

  • To contact (someone via) a pager device. 

  • To telephone a person, only allowing the phone to ring once, in order to request a call back. 

  • To produce a beep. 

  • To have sexual intercourse with - referring to the bleep tone used to censor obscene words in broadcasts 

noun
  • A message sent to a pager device. 

  • A short, electronically produced tone. 

  • The sound produced by the horn of a car, or any similar sound. 

birr

verb
  • To make a whirring noise; make a noise like that of revolving wheels, or of millstones at work. 

  • To lurch or set to spinning. 

noun
  • The currency of Ethiopia, divided into 100 santims. 

  • A strong trilling. 

  • The force of movement; rush, impetus, momentum, driving force 

  • A whirring noise 

  • strength, vigor, energy 

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