Potency rhymes with:
accountancy, consistency, constancy, consultancy, expectancy, hesitancy, incompetency, inconsistency, inconstancy, latency, militancy
Potency sounds like:
padding, pathans, patience, patons, patten's, patting, patton's, petitioning, petitions, pettiness, petting, petunias, photodynamic, photons, pittance, pitting, pitying, pivoting, podiums, podunk, potenza, potions, potomac, pouting, ptomaines, pudding, puddings, pudong, put-ons, putdowns, putnam's, putting, puttnam's, python's