degeneration vs decadency

degeneration and decadency both are nouns.

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

As nouns, degeneration and decadency are synonyms defined as:

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

Other synonyms of degeneration include decadence, degeneracy.

degeneration (noun)	decadency (noun)
passing from a more complex to a simpler biological form	the state of being degenerate in mental or moral qualities
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