The killer whale (Orcinus orca), also referred to as the orca whale or orca, and less commonly as the blackfish, is a toothed whale belonging to the oceanic dolphin family... meaning its a dolphin... The toothed whales (systematic name Odontoceti) form a suborder of the cetaceans, including sperm whales, beaked whales, dolphins, and others. As the name suggests, the suborder is characterized by the presence of teeth rather than the baleen of other whales.Delphinoidea is the largest group of toothed whales with 66 genera in 6 families. The largest living member of the superfamily is the killer whale, which can reach 6 tonnes, while the smallest, Commerson's Dolphin, is also the smallest living cetacean.
Yeah I did know opinions aren't facts. The common name for the order Cetacea is whales, which Odontoceti is a sub-order of. I know people often include the toothed whales from the name whale, but that doesn't mean its correct - many people call koalas, koala bears even though they're not bears. Did you know that common usage does not equal fact?