The term for a plant that can grow in both freshwater and saltwater is "halophyte." Halophytes are specially adapted to thrive in saline environments, and they typically possess unique physiological and structural characteristics that allow them to manage high salt concentrations. These plants play a crucial role in coastal ecosystems, where they contribute to habitat stability, soil health, and biodiversity. Examples of halophytes include saltbushes, mangroves, and seagrasses. Their adaptability to varying salinity levels makes them vital for environmental restoration efforts, particularly in areas affected by salinization and climate change.