You’ll see me (and skeptics in general) talking about “woo.” (Sometimes “woo woo”, but I prefer just “woo.”)
Woo is a word skeptics use as shorthand to describe pseudo-scientific and often anti-scientific ideas - ideas that are irrational and not based on evidence commensurate with the extraordinary nature of the claim. These are ideas that usually rely on magical thinking, are rarely tested to see if they are real, and are usually resistant to reason and contrary evidence.
A woo can also be a person who hold those beliefs. So you could say, for example, “homeopathy is woo” or “woos believe in homeopathy.”
Its use has been criticized because it is seen as insulting. Maybe, but its use is not fallacious if you explain why the woo belief is a woo belief. Irrational beliefs based on magical thinking should be ridiculed. Alternative terms such as “believer” don’t really cut it, in my view.