six vs 6

six and 6 both are nouns.

Word	Noun	Adjective	Verb	Adverb
six	Yes	Yes	No	No
6	Yes	Yes	No	No

As adjectives, six and 6 are synonyms defined as:

Other synonyms of six include half-dozen, half dozen, vi.

As nouns, six and 6 are synonyms defined as:

Other synonyms of six include Captain Hicks, half a dozen, hexad, sestet, sextet, sextuplet, sise, sixer, VI.

six (noun)	6 (noun)
a playing card or domino or die whose upward face shows six pips	the cardinal number that is the sum of five and one
the cardinal number that is the sum of five and one

six (adjective)	6 (adjective)
denoting a quantity consisting of six items or units	denoting a quantity consisting of six items or units