The term 'Ocean GIANT' can be broken down into two crossword solutions: ORCA (4 letters) and GIANT (5 letters). The ORCA, also known as the Killer Whale, is a toothed whale belonging to the oceanic dolphin family. It is the largest member of this family and is found in all oceans, from the frigid Arctic and Antarctic regions to tropical seas. The GIANT is an adjective used to describe something that is much larger than usual. In the context of the ocean, it is often used to describe large creatures such as whales, sharks, and other sea creatures.