One letter apart, completely different physical mechanisms — one is about dissolving into a bulk volume, the other is about sticking to a surface.
It's an easy pair of words to mix up, and the mix-up is more consequential than it looks. Both describe a species being "taken up" by another material, and both show up constantly in gas treatment, water treatment, and separations. But they describe genuinely different physics — one governed by solubility and bulk-phase mixing, the other governed almost entirely by surface area — and designing equipment around the wrong one produces equipment that doesn't work the way you think it does.