progressive vs degressive

progressive is a noun but degressive is not a noun.

Word	Noun	Adjective	Verb	Adverb
progressive	Yes	Yes	No	No
degressive	No	Yes	No	No

progressive (noun)	degressive (noun)
a person who favors a political philosophy of progress and reform and the protection of civil liberties
a tense of verbs used in describing action that is on-going

progressive (adjective)	degressive (adjective)
favoring or promoting progress	going down by steps
(of taxes) adjusted so that the rate increases as the amount of income increases	(of taxes) gradually decreasing in rate on sums below a certain amount
advancing in severity
gradually advancing in extent
favoring or promoting reform (often by government action)
(of a card game or a dance) involving a series of sections for which the participants successively change place or relative position