Regained rhymes with:
gained, abstained, arraigned, ascertained, attained, brained, campaigned, caned, chained, complained, constrained, contained, craned, deigned, detained, disdained, drained, entertained, explained, feigned, gained, grained, ingrained, maintained, maned, obtained, ordained, pained, pertained, planed, preordained, rained, refrained, reigned, reined, remained, restrained, retained, retrained, self-contained, sprained, stained, strained, sustained, trained, unconstrained, unexplained, unrestrained, unstained, untrained, waned
Regained sounds like:
reaganite, reagent, reasoned, reassessment, reassigned, reassignment, reassumed, reawakened, recant, recanted, recent, reckoned, recommend, recommended, recommit, recommited, recondite, recount, recounted, reexamined, regent, regiment, regimented, reichmuth, reigned, reignite, reignited, rejoined, rescind, rescinded, resende, resent, resented, resigned, resonant, resonate, resonated, resound, resumed, richemont, richmond, rosamond, rosamund, rosemead, rosemond, rosemont, rosmunda