backward vs regressive

backward and regressive both are adjectives.

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

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

backward (adverb)	regressive (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