sharper vs card player

sharper and card player both are nouns.

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

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

sharper: 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 sharper include chiseler, chiseller, defrauder, gouger, grifter, scammer, swindler.

sharper (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