I assume someone who can score without help (natural) versus someone who needs to come off screens, curls, or have someone else help him get a shot. Korver vs Carmelo. That would be my guess.
This.
By 'natural' scorer, I mean someone with instincts, the ability to score from different places on the floor and in different situations, a natural shooting stroke and a knack for finishing plays fluidly. The Jazz have been running a system where certain players can score, but only from certain places on the floor and in certain situations. We've also had players who are that gifted athletically that then learn to shoot by repetition and become adequate scoring threats. However, without D.Will setting people up in situations where they could score, the Jazz got stuck moving the ball around unable to do anything, but eventually dump the ball in to Al Jefferson in the post. The Jazz always had the problem of getting their offense disrupted by teams that did their homework. The Lakers were always good at shutting us down. But without D.Will setting people up on a silver platter, it's gotten worse.
Kevin Martin is a natural scorer. Kevin Durant, Paul Pierce, Carmello, Jeff Hornacek, Jamal Crawford, Demarcus Cousins, Hedo Turkoglu, Brandon Roy, etc. are natural scorers. Players like Matt Harpring, Bryon Russel, Raja Bell, AK, Earl Watson, etc. are not and can only score under limited circumstances.