XXII vs twenty-two

XXII and twenty-two both are nouns.

Word	Noun	Adjective	Verb	Adverb
XXII	Yes	No	No	No
twenty-two	Yes	Yes	No	No

As nouns, XXII and twenty-two are synonyms defined as:

XXII and twenty-two: the cardinal number that is the sum of twenty-one and one

Other synonyms of XXII include 22.

XXII (noun)	twenty-two (noun)
the cardinal number that is the sum of twenty-one and one	a .22 caliber firearm (pistol or rifle)
	the cardinal number that is the sum of twenty-one and one

XXII (adjective)	twenty-two (adjective)
	being two more than twenty