These are inapposite. You are working with the adjective; I was working with the noun. You’d be much better off trying to refer to things like koala bears and panda bears, if it wasn’t for the fact that an enlightened public has learned that they aren’t bears, and has stopped calling them that, for the most part.
Oh, and nothing is “closely” related if the relation is at the level of Order. As soon suggest that zebras are closely related to rhinos. :dubious:
While the derivation of “killer” may not have anything to do with the “fact” of killing humans (by the way, a real citation to some reputable reference on this etymology would be helpful; the reference to a pamphlet from the Marine Mammal Center is not), the use of the term “killer whale” both inspires and is at some level inspired by the idea that they can and do kill humans, like sharks, so much so that reference material to the species is at pains to point out the fact that they do not, in fact, kill or attack humans.
Of course they are whales. This is not a formal scientific term, and can be used for any large member of the Order Cetacea. The term “whale” is used for members of several different families. Some of them are much smaller than Killer Whales, such as Pilot Whales, White Whales, and Pygmy Sperm Whales.
What does that have to do with anything? Unlike most whales or dolphins, they are predators on warm-blooded mammals such as other whales and seals. They often kill their prey before eating it, rather than swallowing it whole. To cite the standard mammalogy text Walker’s Mammals of the World (fifth edition), “Orcinus received its common name because it is the world’s largest predator on warm-blooded mammals…”
“Killer Whale” is a perfectly legitimate name for the species in English, and has been used in many standard texts besides *Walker. * Being a standard name, it can’t really be considered a misnomer. But it is not even a misnomer. The species is a whale, and it kills its prey before eating it.
“Orca” is really a kind of PC term that mainly started being promoted once the species began being used in marine shows. Fine to use it, but it hasn’t been the standard name in English or among mammalogists until recently.
What was your original statement based on?
Pandas, at least, are actually true bears, according to the most recent research.