obsolescence vs devolution

obsolescence and devolution both are nouns.

Word	Noun	Adjective	Verb	Adverb
obsolescence	Yes	No	No	No
devolution	Yes	No	No	No

As nouns, devolution is a hypernym of obsolescence; that is, devolution is a word with a broader meaning than obsolescence:

obsolescence: the process of becoming obsolete; falling into disuse or becoming out of date
devolution: the process of declining from a higher to a lower level of effective power or vitality or essential quality

Other hypernyms of obsolescence include degeneration.

obsolescence (noun)	devolution (noun)
the process of becoming obsolete; falling into disuse or becoming out of date	the delegation of authority (especially from a central to a regional government)
	the process of declining from a higher to a lower level of effective power or vitality or essential quality