cinch vs all fours

cinch and all fours both are nouns.

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

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

cinch: a form of all fours in which the players bid for the privilege of naming trumps
all fours: card games in which points are won for taking the high or low or jack or game

Other hypernyms of cinch include high-low-jack.

cinch (noun)	all fours (noun)
a form of all fours in which the players bid for the privilege of naming trumps	card games in which points are won for taking the high or low or jack or game
any undertaking that is easy to do
stable gear consisting of a band around a horse's belly that holds the saddle in place