Impedance rhymes with:
credence, abundance, accordance, ascendance, attendance, avoidance, cadence, coincidence, confidence, correspondence, credence, decadence, dependence, evidence, guidance, imprudence, incidence, independence, interdependence, jurisprudence, kloberdanz, overabundance, overconfidence, overdependence, precedence, providence, prudence, residence, riddance, self-confidence, subsidence, transcendence
Impedance sounds like:
impatience, impatiens, impeding, impotence, ineptness, infatuating, inhabiting, inhibiting, inhibitions, innovating, innovations, invading, invitations, inviting