all fours vs cards

all fours and cards both are nouns.

Word	Noun	Adjective	Verb	Adverb
all fours	Yes	No	No	No
cards	Yes	No	No	No

As nouns, cards is a hypernym of all fours; that is, cards is a word with a broader meaning than all fours:

all fours: card games in which points are won for taking the high or low or jack or game
cards: a game played with playing cards

Other hypernyms of all fours include card game.

all fours (noun)	cards (noun)
card games in which points are won for taking the high or low or jack or game	a game played with playing cards