regressive vs backward

regressive and backward both are adjectives.

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

regressive (adjective)	backward (adjective)
opposing progress; returning to a former less advanced state	directed or facing toward the back or rear
(of taxes) adjusted so that the rate decreases as the amount of income increases	(used of temperament or behavior) marked by a retiring nature
	retarded in intellectual development
	having made less than normal progress

regressive (adverb)	backward (adverb)
	in a manner or order or direction the reverse of normal
	in or to or toward a past time
	at or to or toward the back or rear