The term SEA TERROR is a crossword solution that can be broken down into two words: ORCA (4 letters) and SEA. ORCA is the scientific name for the killer whale, a large marine mammal found in all oceans of the world. It is the largest member of the dolphin family and is known for its intelligence and strength. SEA is a large body of salt water that covers most of the Earth's surface. Together, the two words form the phrase 'SEA terror, ' which is often used to describe the power and ferocity of the killer whale.