card shark vs gouger

card shark and gouger both are nouns.

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

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

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

card shark (noun)	gouger (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
	an attacker who gouges out the antagonist's eye