eight vs 8

eight and 8 both are nouns.

Word	Noun	Adjective	Verb	Adverb
eight	Yes	Yes	No	No
8	Yes	Yes	No	No

As adjectives, eight and 8 are synonyms defined as:

Other synonyms of eight include viii.

As nouns, eight and 8 are synonyms defined as:

Other synonyms of eight include eighter, eighter from Decatur, octad, octet, octonary, ogdoad, VIII.

eight (noun)	8 (noun)
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
the cardinal number that is the sum of seven and one

eight (adjective)	8 (adjective)
being one more than seven	being one more than seven