kinda splitting hairs, but these words do have specific meanings. psychedelics and dissociatives of hallucinogens, a broader category of drugs. you definitely see weird stuff if you take enough ketamine, but the hallucinations have a very different character.

subjectively, I find psychedelics to have more of an "organic" feel and dissociatives to have a more "synthetic" feel, although I imagine others might describe it differently.

It can absolutely induce psychedelic experiences - in medical literature it's not generally (though this is not entirely consistent) classified as a psychedelic.