The orca is not a whale or a shark. The orca is a type of cetacean, a group of marine mammals that includes whales, dolphins, and porpoises. However, orcas are actually considered dolphins, not whales, despite their common nickname "killer whale."
a killer whale is actually called an orca, but the term "killer whale" is mixed up, it actually means "whale killer". in answer to this question a toothed whale. but scientists have argued that a orca may be a dolphin? but that's another question.