buzzer vs doorbell

buzzer

noun
  • A device that makes a buzzing sound. 

  • One who, or that which, buzzes; an insect that buzzes. 

  • A run scored from an overthrow. 

  • A police badge. 

doorbell

noun
  • A device on or adjacent to an outer door for announcing one's presence. It can be mechanical, directly sounding a bell, or a button that electrically sounds a chime or buzzer inside the building. 

  • A button that activates an electric doorbell. 

verb
  • To ring many doorbells of (target people or an area) in an effort to contact people and thereby spread information or solicit. 

  • To ring many doorbells in an effort to contact people and thereby spread information or solicit. 

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