I suppose it also depends on what the other people in your circles are calling things. Language is a living entity, after all.
When I first started learning the terms, I heard "RDA" for drippers and "RBA" for rebuildable tanks. I understood that not all rebuildable were drippers, but didn't see why they should be mutually exclusive. After all,
some (and indeed, most of what I had seen at the time) of the rebuildable atomizers I had seen were indeed dripping atomizers as well. So it didn't make any sense to exclude drippers from the realm of "rebuildable atomizers," but it was what it was. Then people started using RTA for tanks and RBA to mean any of them. This makes a lot more sense, logically, and so is what I continue to use, to this day.
This was all before Kanger came out with their Subtank and its "rebuildable section" or "RBA deck" or "head" or "unit" or whatever you want to call it. The way I see it, that rebuildable section makes an "RTA" out of what is otherwise a glorified clearomizer (an all-in-one tank and atomizer system, with see-through outer walls or windows, and a disposable, replaceable coil unit.) On the other hand, if you use some other terminology, and people understand what you mean, then the language is doing its job. I don't necessarily have to agree with it, but I do acknowledge that it happens. Just don't say crap like "supposably" or "could of" around me, and we'll be alright