I think people associate Nash more as a passer than a shooter. He definitely has a great jump shot and is very accurate. But guys like Miller, Allen, Petrovic, Bird, etc. are also extremely deadly shooters, and they make/made their living by getting a high volume of shots with excellent efficiency.
I think Nowitzki has a great shot, but I don't associate him as a "shooter" like the other players. In others, shooters tend to be SGs or SFs - players who come off screens to shoot a J and who live on the perimeter.