card game vs long whist

card game and long whist both are nouns.

Word	Noun	Adjective	Verb	Adverb
card game	Yes	No	No	No
long whist	Yes	No	No	No

As nouns, long whist is a hyponym of card game; that is, long whist is a word with a more specific, narrower meaning than card game:

card game: a game played with playing cards
long whist: a card game for four players who form two partnerships; a pack of 52 cards is dealt and each side scores one point for each trick it takes in excess of six

card game (noun)	long whist (noun)
a game played with playing cards	a card game for four players who form two partnerships; a pack of 52 cards is dealt and each side scores one point for each trick it takes in excess of six