one-quarter vs twenty-five percent

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

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

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

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

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