twenty-five percent vs fourth

twenty-five percent and fourth both are nouns.

Word	Noun	Adjective	Verb	Adverb
twenty-five percent	Yes	No	No	No
fourth	Yes	Yes	No	Yes

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

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

twenty-five percent (noun)	fourth (noun)
one of four equal parts	the musical interval between one note and another four notes away from it
	one of four equal parts
	following the third position; number four in a countable series

twenty-five percent (adjective)	fourth (adjective)
	coming next after the third and just before the fifth in position or time or degree or magnitude

twenty-five percent (adverb)	fourth (adverb)
	in the fourth place