My suggestion is that you do your own research on these terms and categories. Tons of info online that you can read and make your own understanding and interpretations that works for you, instead of relying on one person's definitions. The latter would most likely be inaccurate as these are far from hard science, strict rules or something that can be easily described using the senses. I remember you asking similar before - I imagine people are reluctant to answer because of the obscure and subjective nature of these things. Maybe the psychologist is the easiest: I think in the US it is typically someone with a degree in Psychology, for a T usually a PhD in Clinical/Counseling Psychology. But the public uses it to just describe professionals why deal with psychological issues and have training in those.