Decadence rhymes with:
confidence, evidence, incidence, precedence, providence, self-confidence, abundance, accordance, ascendance, attendance, avoidance, cadence, coincidence, confidence, correspondence, credence, dependence, evidence, guidance, impedance, imprudence, incidence, independence, interdependence, jurisprudence, kloberdanz, overabundance, overconfidence, overdependence, precedence, providence, prudence, residence, riddance, self-confidence, subsidence, transcendence
Decadence sounds like:
d'agostino's, d'estaing, dakotans, deciding, decoding, dedicating, deducting, deductions, destinies, detecting, dickstein's, dicostanzo, dictating, digesting, disdaining, disdains, disgusting, disquieting, dissecting, dissections, dissidence, distance, distances, distinguish, distinguishes, dusting