Cetaceans are a group of aquatic mammals that include whales, porpoises, and dolphins. The term cetacean is derived from the Latin word for WHALE, cetus. The five crossword solutions for cetacean are WHALE (5 letters), NARWHAL (7 letters), PORPOISE (8 letters), ORCA (4 letters), and narwal (6 letters). Whales are the largest of the cetaceans and can be found in all oceans. Narwhals are a type of WHALE with a long tusk that lives in the Arctic Ocean. Porpoises are smaller than whales and have a more rounded body shape. Orcas, also known as killer whales, are the largest species of dolphin and are found in all oceans. Narwals are a type of WHALE with a long tusk that live in the Arctic Ocean.