twenty-two vs 22

twenty-two and 22 both are nouns.

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

As adjectives, twenty-two and 22 are synonyms defined as:

Other synonyms of twenty-two include xxii.

As nouns, twenty-two and 22 are synonyms defined as:

twenty-two and 22: the cardinal number that is the sum of twenty-one and one

Other synonyms of twenty-two include XXII.

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

twenty-two (adjective)	22 (adjective)
being two more than twenty	being two more than twenty