| flash(noun, alert, cry, caution, signal) |
| fore(noun, sign, notice, alert, caution) |
| foretoken(noun, information, sign, notice, alert) |
| forewarning(noun, sign, notice, alert, caution) |
| gong(noun, alert, cry, caution, signal) |
| guidance(noun, information, sign, notice, alert) |
| handwriting on wall(noun, expression, idiom, information, sign) |
| heads up(noun, expression, information, sign, notice) |
| high sign(noun, expression, sign, alert, caution) |
| hint(noun, sign, notice, alert, caution) |
| horn(noun, alert, cry, caution, signal) |
| information(noun, sign, notice, alert, caution) |
| injunction(noun, information, sign, notice, alert) |
| intimation(noun, information, sign, notice, alert) |
| lesson(noun, information, sign, notice, alert) |
| look out(noun, expression, information, sign, notice) |
| nod(noun, sign, alert, cry, caution) |
| notification(noun, information, sign, notice, alert) |
| presage(noun, sign, notice, alert, caution) |
| recommendation(noun, information, sign, notice, alert) |