I'm not sure why you're trying to make that point in response to my comment, as it's immaterial to my comment.Of course, pistols were being called pistols, before there were revolving pistols.
My point is that while revolvers are handguns, they are not pistols. Specifically, pistols are handguns with one or more stationary chambers. Revolvers are handguns that use multiple rotating chambers. Pistols and revolvers are mutually exclusive terms. They are both handguns, but pistols are not revolvers and revolvers are not pistols.