regressive vs reverting

regressive is not a noun while reverting is a noun.

Word	Noun	Adjective	Verb	Adverb
regressive	No	Yes	No	No
reverting	Yes	Yes	No	No

regressive (noun)	reverting (noun)
	a failure to maintain a higher state

regressive (adjective)	reverting (adjective)
opposing progress; returning to a former less advanced state	tending to return to an earlier state
(of taxes) adjusted so that the rate decreases as the amount of income increases