Brackish water is a term used to describe a mixture of freshwater and saltwater. However, there are several other synonyms used to refer to this type of water. One such synonym is saline water, which typically contains a higher concentration of salt than brackish water. Another synonym is estuarine water, typically found in the transition zone between rivers and oceans. Similarly, the term coastal water refers to the area where freshwater from rivers or streams mixes with seawater from the ocean. Finally, the term littoral water refers to the near-shore areas where freshwater flows into the ocean. Overall, there are many terms that refer to brackish water depending on the location and composition of the water.