Tricky question. I'd say scientists are basically people who obtain knowledge by quantitative, empirical, objective research methods. Maybe not necessarily only Naturwissenschaftler, but in practice, that's pretty much the default meaning.
In my opinion at least, not every field that includes the word 'scientist' in its name is really considered a true science. That is, social scientists are sort of on the borderline, in a gray area between the sciences and the humanities (along with psychology and IMO also psychiatry), and political scientists are in my opinion a subset of (modern) historians. Computer scientists, on the other hand, are more like a subset of engineers; there you have the question of whether engineering is more science or technology, but I think in traditional terms it's more the latter.
The word 'scientists' definitely does not include academic specialists from the humanities or fine arts, though. So, for example, it would not include historians, literary critics, philosophers, theologians, art historians, musicologists ... I'm not sure it would even include mathematicians (pure, as opposed to applied).
So if you want a more inclusive word, I would suggest 'academics' or 'scholars.'
I would also suggest searching in Suche in allen Foren, as I think this has come up several times before.