The term UNDERWATER RAY can be solved by the five-letter word MANTA. The MANTA Ray is a species of ray that lives in tropical and subtropical waters around the world. They are large, flat fish with triangular pectoral fins, horn-shaped cephalic fins, and large, forward-facing mouths. They are filter feeders, meaning they feed on plankton and other small organisms. MANTA Rays are often seen swimming near the surface of the water, but they can also dive to depths of up to 1, 000 feet.