twenty-three vs XXIII

twenty-three and XXIII both are nouns.

Word	Noun	Adjective	Verb	Adverb
twenty-three	Yes	Yes	No	No
XXIII	Yes	No	No	No

As nouns, twenty-three and XXIII are synonyms defined as:

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

Other synonyms of twenty-three include 23.

twenty-three (noun)	XXIII (noun)
the cardinal number that is the sum of twenty-two and one	the cardinal number that is the sum of twenty-two and one

twenty-three (adjective)	XXIII (adjective)
being three more than twenty