fire alarm vs monition

fire alarm

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

  • 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. 

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

monition

noun
  • A sign of impending danger; an omen. 

  • A caution or warning. 

  • A legal notification of something. 

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