decadency vs degeneration

decadency and degeneration both are nouns.

Word	Noun	Adjective	Verb	Adverb
decadency	Yes	No	No	No
degeneration	Yes	No	No	No

As nouns, decadency and degeneration are synonyms defined as:

decadency and degeneration: the state of being degenerate in mental or moral qualities

Other synonyms of decadency include decadence, degeneracy.

decadency (noun)	degeneration (noun)
the state of being degenerate in mental or moral qualities	passing from a more complex to a simpler biological form
	the process of declining from a higher to a lower level of effective power or vitality or essential quality
	the state of being degenerate in mental or moral qualities