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They are synonyms - https://en.wikipedia.org/wiki/Card_sharp. Curiously, I've never heard the term "card sharp" before (or I mis-heard it as "card shark").

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I'm hopeful they will carry slightly different meanings in the future, where "card sharp" isn't pejorative but "card shark" is. Actually, today is the first time I've heard the term "card shark". Ahhh, English...

I suspect card shark has bled over from loan shark or some other term like that

Pool shark perhaps?

https://en.m.wikipedia.org/wiki/Pool_shark

I think that term (shark vs. the original sharp) got popular due to a TV game show by the name "Card Sharks".

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