Fluviomarine is a term used to describe landforms and processes that occur where rivers meet the sea. If you are looking for synonyms for the word fluviomarine, you may come across a few options that are commonly used interchangeably. One such word is estuarine, which refers to the tidal mouth of a large river where freshwater and seawater blend. Another term you might find is deltaic, which relates to the formation of deltas at the mouth of a river. Coastal alluvial is another synonym that describes landforms made up of sediment deposited by rivers and ocean currents along the coast. Finally, the word brackish can also be used to describe areas where freshwater mixes with salty seawater.