| Rating | Solver | Clue |
|---|---|---|
| KLAXON | Warning sound | |
| SIREN | Warning sound | |
| ALARM | Warning sound or device | |
| ALERT | An alarm from a real or threatened attack; a sudden attack; also, a bugle sound to give warning. | |
| KNELL | To sound as a knell; especially, to toll at a death or funeral; hence, to sound as a warning or evil omen. | |