Fidelity's rhymes with:
fidelities, fidelities, fidelities, fidelities, abilities, abnormalities, brutalities, capabilities, commonalities, disabilities, facilities, fatalities, fidelities, formalities, generalities, hostilities, liabilities, modalities, possibilities, probabilities, qualities, realities, responsibilities, technicalities, tonalities, utilities, utilities', utility's
Fidelity's sounds like:
fatalities, feedlots, fidelities, footholds