6 vs six

6 and six both are nouns.

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

As adjectives, 6 and six are synonyms defined as:

Other synonyms of 6 include half-dozen, half dozen, vi.

As nouns, 6 and six are synonyms defined as:

Other synonyms of 6 include Captain Hicks, half a dozen, hexad, sestet, sextet, sextuplet, sise, sixer, VI.

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

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