card shark vs swindler

card shark and swindler both are nouns.

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

As nouns, swindler is a hypernym of card shark; that is, swindler 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
swindler: a person who swindles you by means of deception or fraud

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

card shark (noun)	swindler (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