Things that are thrown or washed into the sea, or things that are found in the sea.
Seawares can be interesting to find, but they can also be harmful to sea animals.
Examples:
The children found some seawares on the beach.
The seawares were floating in the water.
The seawares are dirty and need to be cleaned up.
The seawares looked like treasures from the sea.
The seawares were so many, it looked like a big mess in the water.
The seawares were full of surprises for the children to find.