degeneracy vs decadency

degeneracy and decadency both are nouns.

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

As nouns, degeneracy and decadency are synonyms defined as:

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

Other synonyms of degeneracy include decadence, degeneration.

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