fire alarm 
noun
A device making a loud noise that gives warning of a fire: a fire alarm went off and the building had to be evacuated...
- This time the ringing noise wasn't the fire alarm, but the dinner bell.
- That was when the idiots decided to test the fire alarm without the usual warning over the speakers.
- One girl bolted to the fire alarm and pulled it, setting the siren wailing and then sprinting for the door.
- earmuffs
- earn
- earned income
- earned run
- earned run average
- earner
- earnest
- earnestly
- earnest money
- earnestness
- earnest penny
- earnful
- Earnhardt, Dale
- earningland
- earnings
- earnings drift
- earn one's corn
- earn one's keep
- earn one's stripes
- earn (or turn) an honest penny
- earn-out
- earn something out
- EAROM
- ear opening
- earphone