2 vs craps

2 and craps both are nouns.

Word	Noun	Adjective	Verb	Adverb
2	Yes	Yes	No	No
craps	Yes	No	No	No

As nouns, craps is a hyponym of 2; that is, craps is a word with a more specific, narrower meaning than 2:

2: the cardinal number that is the sum of one and one or a numeral representing this number
craps: expressions used when two dice are thrown and both come up showing one spot

Other hyponyms of 2 include snake eyes, brace, couple, couplet, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke.

2 (noun)	craps (noun)
the cardinal number that is the sum of one and one or a numeral representing this number	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

2 (adjective)	craps (adjective)
being one more than one