Red water is a term that refers to water that is discolored, usually due to the presence of rust or minerals. However, there are several different synonyms for red water that can be used depending on the context. Some common synonyms include brown water, rust-colored water, or even muddy water, depending on the specific hue of the discoloration. In some cases, red water can also be referred to as tainted water, contaminated water, or polluted water if it is deemed unsafe for consumption or household use. Overall, the specific synonym used for red water will depend on the situation and the nature of the discoloration.