| horn(noun, alert, caution, signal) |
| whistle(noun, alert, caution, signal) |
| warning(noun, alert, caution, signal) |
| tocsin(noun, alert, caution, signal) |
| buzzer(noun, alert, caution, signal) |
| call(noun, alert, caution, signal) |
| gong(noun, alert, caution, signal) |
| high sign(expression, alert, caution, signal) |
| signaling device(expression, alert, caution, signal) |
| tip off(expression, alert, caution, signal) |
| SOS(alert, caution, signal, warning) |
| blast(alert, caution, signal, warning) |
| clock(alert, caution, signal, warning) |
| drum(alert, caution, signal, warning) |
| flap(alert, caution, signal, warning) |
| flash(alert, caution, signal, warning) |
| nod(alert, caution, signal, warning) |
| scramble(alert, caution, signal, warning) |
| scream(alert, caution, signal, warning) |
| shout(alert, caution, signal, warning) |