eight-spot vs eight

eight-spot and eight both are nouns.

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

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

eight-spot and eight: one of four playing cards in a deck with eight pips on the face

eight-spot (noun)	eight (noun)
one of four playing cards in a deck with eight pips on the face	one of four playing cards in a deck with eight pips on the face
	the cardinal number that is the sum of seven and one

eight-spot (adjective)	eight (adjective)
	being one more than seven