Sorry. Wrong.
Camber, to be specific, refers to a ski's convexity. If you put an unmounted ski down on a flat surface, you'll notice that the tip and tail touch, but the ski arcs across its length, with the middle being higher, and therefore not touching the flat surface. The height of that arc = camber.
Flex is 100% different from camber, though they are, or rather can be, related.
Rockered tips/tails are generally accepted to be different from reverse camber, as explained by someone else further up. To be brief: reverse camber = the old spatula, where the entire ski was shaped like a banana. Think "normal ski", but turned upside down so that only the middle of the ski would touch the aforementioned flat surface.
Rockered tips/tails = tips/tails that rise up, mimicking the effect of reverse camber. Big difference? The middle of the ski is either flat (and therefore touching the flat surface it's on) for much more of the ski's running surface, or might even have, gasp!, regular camber.
We could go on, but I don't see a need.