retrogression vs transmutation

retrogression and transmutation both are nouns.

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

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

Other hypernyms of retrogression include shift, transformation.

retrogression (noun)	transmutation (noun)
returning to a former state	an act that changes the form or character or substance of something
passing from a more complex to a simpler biological form	a qualitative change
	(physics) the change of one chemical element into another (as by nuclear decay or radioactive bombardment)