card shark vs scammer

card shark and scammer both are nouns.

Word	Noun	Adjective	Verb	Adverb
card shark	Yes	No	No	No
scammer	Yes	No	No	No

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

card shark: a professional card player who makes a living by cheating at card games
scammer: a person who swindles you by means of deception or fraud

Other hypernyms of card shark include card player, chiseler, chiseller, defrauder, gouger, grifter, swindler.

card shark (noun)	scammer (noun)
a professional card player who makes a living by cheating at card games	a person who swindles you by means of deception or fraud