retrogression vs transformation

retrogression and transformation both are nouns.

Word	Noun	Adjective	Verb	Adverb
retrogression	Yes	No	No	No
transformation	Yes	No	No	No

As nouns, transformation is a hypernym of retrogression; that is, transformation is a word with a broader meaning than retrogression:

Other hypernyms of retrogression include shift, transmutation.

retrogression (noun)	transformation (noun)
returning to a former state	the act of changing in form or shape or appearance
passing from a more complex to a simpler biological form	(genetics) modification of a cell or bacterium by the uptake and incorporation of exogenous DNA
	a rule describing the conversion of one syntactic structure into another related syntactic structure
	a qualitative change
	(mathematics) a function that changes the position or direction of the axes of a coordinate system