- killer whale, killer, orca, grampus, sea wolf, Orcinus orca - predatory black-and-white toothed whale with large dorsal fin; common in cold seas
--1 is a kind of dolphin
--1 is a member of Orcinus, genus Orcinus - grampus, Grampus griseus - slaty-gray blunt-nosed dolphin common in northern seas
--2 is a kind of dolphin
--2 is a member of genus Grampus