buzzer vs mayday

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. 

mayday

noun
  • An international distress signal used by shipping and aircraft. 

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