twenty-nine vs XXIX

twenty-nine and XXIX both are nouns.

Word	Noun	Adjective	Verb	Adverb
twenty-nine	Yes	Yes	No	No
XXIX	Yes	No	No	No

As nouns, twenty-nine and XXIX are synonyms defined as:

twenty-nine and XXIX: the cardinal number that is the sum of twenty-eight and one

Other synonyms of twenty-nine include 29.

twenty-nine (noun)	XXIX (noun)
the cardinal number that is the sum of twenty-eight and one	the cardinal number that is the sum of twenty-eight and one

twenty-nine (adjective)	XXIX (adjective)
being nine more than twenty