twenty-five percent vs one-quarter

twenty-five percent and one-quarter both are nouns.

Word	Noun	Adjective	Verb	Adverb
twenty-five percent	Yes	No	No	No
one-quarter	Yes	No	No	No

As nouns, twenty-five percent and one-quarter are synonyms defined as:

Other synonyms of twenty-five percent include fourth, fourth part, one-fourth, quarter, quartern.

twenty-five percent (noun)	one-quarter (noun)
one of four equal parts	one of four equal parts