| Answer | Crossword Clue |
|---|---|
| siren | a device that produces a piercing warning sound |
| sirens | SIREN, a device that produces a piercing warning sound |
| syren | a siren (a device that produces a piercing warning sound) |
| syrens | SYREN, a siren (a device that produces a piercing warning sound) |
| pyrostat | safety device that, when a fire breaks out in its vicinity, automatically causes a mechanism to sound a warning alarm |
| foghorns | A device making a loud, deep sound as a warning to ships in fog |
| foghorn | A device making a loud, deep sound as a warning to ships in fog |
