dice vs four

dice and four both are nouns.

Word	Noun	Adjective	Verb	Adverb
dice	Yes	No	Yes	No
four	Yes	Yes	No	No

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

dice: a small cube with 1 to 6 spots on the six faces; used in gambling to generate random numbers
four: a playing card or domino or die whose upward face shows four pips

Other hyponyms of dice include five-spot, five, four-spot, one-spot, six-spot, six, D4.

dice (noun)	four (noun)
a small cube with 1 to 6 spots on the six faces; used in gambling to generate random numbers	a playing card or domino or die whose upward face shows four pips
	the cardinal number that is the sum of three and one

dice (adjective)	four (adjective)
	being one more than three

dice (verb)	four (verb)
play dice
cut into cubes