buzzer vs fire alarm

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. 

fire alarm

noun
  • An electromechanical or electronic bell, klaxon, chime, horn, speaker, strobe light or other device which warns people in a building of a possible fire or other condition requiring evacuation. 

  • The sound or other warning made by a fire alarm. 

  • An emergency response to a fire by the fire department with manpower and equipment. 

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