all fours vs high-low-jack

all fours and high-low-jack both are nouns.

Word	Noun	Adjective	Verb	Adverb
all fours	Yes	No	No	No
high-low-jack	Yes	No	No	No

As nouns, all fours and high-low-jack are synonyms defined as:

all fours and high-low-jack: card games in which points are won for taking the high or low or jack or game

all fours (noun)	high-low-jack (noun)
card games in which points are won for taking the high or low or jack or game	card games in which points are won for taking the high or low or jack or game