chemin de fer vs card game

chemin de fer and card game both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemin de fer	Yes	No	No	No
card game	Yes	No	No	No

As nouns, card game is a hypernym of chemin de fer; that is, card game is a word with a broader meaning than chemin de fer:

chemin de fer: a card game played in casinos in which two or more punters gamble against the banker; the player wins who holds 2 or 3 cards that total closest to nine
card game: a game played with playing cards

Other hypernyms of chemin de fer include cards.

chemin de fer (noun)	card game (noun)
a card game played in casinos in which two or more punters gamble against the banker; the player wins who holds 2 or 3 cards that total closest to nine	a game played with playing cards