regressive vs throwback

regressive is not a noun while throwback is a noun.

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

regressive (noun)	throwback (noun)
	a reappearance of an earlier characteristic
	an organism that has the characteristics of a more primitive type of that organism

regressive (adjective)	throwback (adjective)
opposing progress; returning to a former less advanced state	characteristic of an atavist
(of taxes) adjusted so that the rate decreases as the amount of income increases