A warning light is a visual signal indicating that something is wrong or there is a danger ahead. There are different synonyms that can be used instead of warning light. A few examples are caution light, signal light, alert light, danger light, and flashing light. A caution light implies the need to be careful or proceed with caution. Signal light can also be used in place of warning light in contexts where signals need to be conveyed. Alert light and danger light signify impending danger and the need for immediate action. Finally, a flashing light can be used to draw attention to an emergency or dangerous situation. In conclusion, there are several alternative words for warning light based on the specific context.