twenty-five vs XXV

twenty-five and XXV both are nouns.

Word	Noun	Adjective	Verb	Adverb
twenty-five	Yes	Yes	No	No
XXV	Yes	No	No	No

As nouns, twenty-five and XXV are synonyms defined as:

twenty-five and XXV: the cardinal number that is the sum of twenty-four and one

Other synonyms of twenty-five include 25.

twenty-five (noun)	XXV (noun)
the cardinal number that is the sum of twenty-four and one	the cardinal number that is the sum of twenty-four and one

twenty-five (adjective)	XXV (adjective)
being five more than twenty