Futility rhymes with:
utility, utility, ductility, fertility, hostility, utility, versatility, volatility, ability, acceptability, adaptability, admissibility, affordability, agility, amiability, applicability, availability, capability, civility, combinability, compatibility, comprehensibility, debility, deductibility, docility, ductility, electability, feasibility, fertility, flexibility, fragility, hostility, inaccessibility, invisibility, irresponsibility, irritability, legibility, malleability, mobility, nobility, overwhelmability, palatability, possibility, probability, rehability, reliability, responsibility, senility, susceptibility, utility, versatility, viability, virility, volatility
Futility sounds like:
fatality, feedlot, fiddled, fidelity, foothold