Will, the term you created sounds good but I believe Zombies and Vampires fall into what is known as the “Undead” category. As for Werewolves, I think they're also known as “Lycanthropes”, not really ectoplasmic in nature at all.
Like I've said before, Ghostbusters International handles more than just pesky ghosts, we also are equipped to deal with Cryptozooilogical and Cryptid creatures as well. Here are some definitions for those…
Cryptozoology is the study of and the search for animal species whose existence has not been substantiated, and that are not formally recognized by science and/or currently catalogued in the world's zoological databases, but that are supported in some way by testimony (in its broadest definition) from a individual or individuals.
And a Cryptid is any unknown living animal, including any species of the sea, fresh water habitats, land or air that are not currently recognized in the international zoological catalogues.
This category may also include species from the fossil records such as dinosaurs, reptiles, fish, mammals, and even birds that were thought long extinct, but which may in fact still survive in remote geographical locations around the world; and last, but not the least, unidentified primates and unknown species of human beings that have successfully hidden themselves away in remote wild places around the world.
I'm afraid you're trying to tie up too many creatures into just one term, when several terms are actually needed.