I'm a little confused by this. I know what champion monsters are, but above that, things get... odd.
In the wiki there's a Boss page and a Bosses page. Apparently, "Bosses" are super-special "Boss"es, and it seems like they are all "SuperUniques", even though Superunique redirects to "Bosses".
So, are "Boss"es Superuniques, or just "Bosses"? Also, why are Bosses called SuperUniques if there are no Uniques? Quest boss is a category, but how are they different from "Bosses"? My brain hurts.
Hopefully, you can understand my confusion.
So what are the official names of these different tiers?
Rare Spawns, like Dataminer and Firestarter.
Rare Fixed Spawns, like Lloigor the Crazed.
Rare Fixed Event Spawns, like Lord Dunhyld.
Fixed Quest Spawns, like Manglemaw and Mira Eamon. (Although you don't have to kill manglemaw to continue....)
Quest Bosses, like Headcleaver and Captain Dalton.
Act Bosses, like Diablo.