Expound rhymes with:
impound, lb, pound, propound, abound, aground, around, astound, bound, browned, confound, crowned, downed, drowned, found, frowned, ground, hound, impound, inbound, lb, mound, newfound, pound, profound, propound, rebound, redound, renowned, resound, round, sound, surround, ultrasound, unbound, unsound, unwound, wound
Expound sounds like:
equipment, escapement, expand, expanded, expend, expended, exponent, expounded