twenty-seven vs XXVII

twenty-seven and XXVII both are nouns.

Word	Noun	Adjective	Verb	Adverb
twenty-seven	Yes	Yes	No	No
XXVII	Yes	No	No	No

As nouns, twenty-seven and XXVII are synonyms defined as:

twenty-seven and XXVII: the cardinal number that is the sum of twenty-six and one

Other synonyms of twenty-seven include 27.

twenty-seven (noun)	XXVII (noun)
the cardinal number that is the sum of twenty-six and one	the cardinal number that is the sum of twenty-six and one

twenty-seven (adjective)	XXVII (adjective)
being seven more than twenty