high-low-jack vs cinch

high-low-jack and cinch both are nouns.

Word	Noun	Adjective	Verb	Adverb
high-low-jack	Yes	No	No	No
cinch	Yes	No	Yes	No

As nouns, cinch is a hyponym of high-low-jack; that is, cinch is a word with a more specific, narrower meaning than high-low-jack:

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

Other hyponyms of high-low-jack include auction pitch, pitch, old sledge, seven-up.

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