[Ge0ffrey]

Those are killer dolphins, not whales. They are from the dolphin family.

[Harmless Teddy Bear]

They are toothed whales but whales is the correct word.

They actually are called Killer Whales because they attack and eat other whales.

[fr_freak]

Those are killer dolphins, not whales. They are from the dolphin family.

Orcas are dolphins, but they have been nicknamed "killer whales" for a very long time, most likely since before it was determined that they were, in fact, in the dolphin family.