Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun fire_alarm

2 senses of fire alarm

Sense 1
fire alarm -- (a shout or bell to warn that fire has broken out)
       => alarm, alert, warning signal, alarum -- (an automatic signal (usually a sound) warning of danger)

Sense 2
fire alarm, smoke alarm -- (an alarm that is tripped off by fire or smoke)
       => alarm, warning device, alarm system -- (a device that signals the occurrence of some undesirable event)