| Solution | Length | |
|---|---|---|
| 3 letters | ||
| sos | 3 | |
| 4 letters | ||
| lamp | 4 | |
| pyre | 4 | |
| wink | 4 | |
| sign | 4 | |
| 5 letters | ||
| pylon | 5 | |
| light | 5 | |
| shoot | 5 | |
| tower | 5 | |
| touch | 5 | |
| siren | 5 | |
| shine | 5 | |
| 6 letters | ||
| rocket | 6 | |
| tocsin | 6 | |
| signal | 6 | |
| WIGWAG | 6 | |
| 7 letters | ||
| precede | 7 | |
| radiate | 7 | |
| whistle | 7 | |
| 8 letters | ||
| radiator | 8 | |
| ringside | 8 | |
| 9 letters | ||
| semaphore | 9 | |
| wind sock | 9 | |
| spotlight | 9 | |
| spearhead | 9 | |
| red light | 9 | |
| red flag | 9 | |
| 10 letters | ||
| WATCHTOWER | 10 | |
| 11 letters | ||
| white flag | 11 | |
| TRANSMITTER | 11 | |
| stop light | 11 | |
| 12 letters | ||
| roman candle | 12 | |
| 13 letters | ||
| traffic light | 13 | |
| 17 letters | ||
| radio transmitter | 17 | |