Subsidence rhymes with:
guidance, abundance, accordance, ascendance, attendance, avoidance, cadence, coincidence, confidence, correspondence, credence, decadence, dependence, evidence, guidance, impedance, imprudence, incidence, independence, interdependence, jurisprudence, kloberdanz, overabundance, overconfidence, overdependence, precedence, providence, prudence, residence, riddance, self-confidence, transcendence
Subsidence sounds like:
scapegoating, sebastian's, sebastianis, subjecting, subsiding, subsistence, substance, substances, substituting, substitutions, subsystems, suffocating, suppositions, suspecting