four-spot vs four

four-spot and four both are nouns.

Word	Noun	Adjective	Verb	Adverb
four-spot	Yes	No	No	No
four	Yes	Yes	No	No

As nouns, four-spot and four are synonyms defined as:

four-spot and four: a playing card or domino or die whose upward face shows four pips

four-spot (noun)	four (noun)
a playing card or domino or die whose upward face shows four pips	a playing card or domino or die whose upward face shows four pips
	the cardinal number that is the sum of three and one

four-spot (adjective)	four (adjective)
	being one more than three