• ewater,
• seanate,
• senater,
• searate,
• salwater,
• swater,
• awater,
• seawatch,
• seasmter,
• seaqater,
• sewater,
• seawter,
• saewater,
• ceawater,
• shearwateer,
• sharwater,
• sherawater,
• atawater,
• sodawatr,
• cewater

• seiter,
• setaria,
• seder,
• sea otter,
• setter.

The adjective form of the word "seawater" is "seawater". However, if you're looking for an alternative adjective, you could use "marine". Example: "marine environment" or "marine life".

The plural of the "seawater" can be the "seawaters".

The singular of the "seawater" can be the "seawater".