reverting vs regressive

reverting is a noun but regressive is not a noun.

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

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

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