vingt-et-un vs card game

vingt-et-un and card game both are nouns.

Word	Noun	Adjective	Verb	Adverb
vingt-et-un	Yes	No	No	No
card game	Yes	No	No	No

As nouns, card game is a hypernym of vingt-et-un; that is, card game is a word with a broader meaning than vingt-et-un:

vingt-et-un: a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21
card game: a game played with playing cards

Other hypernyms of vingt-et-un include cards.

vingt-et-un (noun)	card game (noun)
a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21	a game played with playing cards