gambling game vs craps

gambling game and craps both are nouns.

Word	Noun	Adjective	Verb	Adverb
gambling game	Yes	No	No	No
craps	Yes	No	No	No

As nouns, craps is a hyponym of gambling game; that is, craps is a word with a more specific, narrower meaning than gambling game:

gambling game: a game that involves gambling
craps: a gambling game played with two dice; a first throw of 7 or 11 wins and a first throw of 2, 3, or 12 loses and a first throw of any other number must be repeated to win before a 7 is thrown, which loses the bet and the dice

Other hyponyms of gambling game include fan tan, fantan, drawing, lottery, roulette, banking game.

gambling game (noun)	craps (noun)
a game that involves gambling	a gambling game played with two dice; a first throw of 7 or 11 wins and a first throw of 2, 3, or 12 loses and a first throw of any other number must be repeated to win before a 7 is thrown, which loses the bet and the dice
	expressions used when two dice are thrown and both come up showing one spot