The term “Dúnedain” means the Númenoreans. It comes from “dun” (West) and “edain” (plural of “adan”, man; hence, men). “Men of the West” would be a good translation; Tolkien uses “Westernesse” to translate the name “Númenor”, so you could also translate it “Men of Westernesse”. The term in Westron was “Adûn”, but that’s rare, apparently.
It’s unclear as I recall whether or not the Númenoreans who settled along the shores of Middle-Earth in the Second Age were called Dúnedain by the inhabitants who spoke Sindarin or not. But it clearly applies to both the North and South kingdoms equally.
“Ranger”, of course, is solely applied to the Dúnedain of the North Kingdom after that kingdom falls to the “Witch-king” of Angmar.
As I understand it, the difference is because being the true owner of something is very powerful in the Tolkien magic system.
Sauron is personally very powerful but in no way the true owner of the palantir he has, so his hold over it is weakened.
Suruman was powerul but not the true owner, so Sauron could influence him through the palantir.
Perrin is neither personally powerful nor the true owner, [so Sauron can outright dominate him through it.
Aragorn is nowhere near as powerful as Sauron, but is the true owner of the palantir, so can override Sauron’s influence on it.](Pippin Took - Wikipedia)
Denethor was strong willed and as Steward essentially a lawfully deputized owner, but not the* true *owner. So Sauron couldn’t directly control him or force the palantir to show lies, but could cause it to show only the truth he wanted Denethor to see.
Well, it’s about legitimate authority in general, not just ownership. See also, for instance, the confrontation between Gandalf and Saruman, where the former strips the latter of his position.
Assuming that by “Perrin” you mean Peregrin Took (Pippen), then Sauron is in control of the Palantir, but does not dominate Pippen through it, because hobbit.
Thank you for the clarification, and my apologies. I thought the only Dúnedain left on Middle Earth were the “rangers” (hence their long life spans), and the 2 terms meant the same thing. I didn’t realize that Denethor would still be considered one of them, I thought he was one of the “watered down” race of modern men.
Sauron doesn’t actually dominate Pippin through the Palantir, but then, he only looked into it for a few seconds. If he had held onto it for longer, it was a very real danger.