decadency vs degeneracy

decadency and degeneracy both are nouns.

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

As nouns, decadency and degeneracy are synonyms defined as:

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

Other synonyms of decadency include decadence, degeneration.

decadency (noun)	degeneracy (noun)
the state of being degenerate in mental or moral qualities	moral perversion; impairment of virtue and moral principles
	the state of being degenerate in mental or moral qualities