cardsharp vs card player

cardsharp and card player both are nouns.

Word	Noun	Adjective	Verb	Adverb
cardsharp	Yes	No	No	No
card player	Yes	No	No	No

As nouns, card player is a hypernym of cardsharp; that is, card player is a word with a broader meaning than cardsharp:

cardsharp: a professional card player who makes a living by cheating at card games
card player: someone who plays (or knows how to play) card games

Other hypernyms of cardsharp include chiseler, chiseller, defrauder, gouger, grifter, scammer, swindler.

cardsharp (noun)	card player (noun)
a professional card player who makes a living by cheating at card games	someone who plays (or knows how to play) card games