Dehydrated rhymes with:
coarticulated, dedicated, desiccated, disassociated, discombobulated, elaborated, elongated, insubstantiated, matriculated, palpitated, prevaricated, validated, variegated, vociferated
Dehydrated sounds like:
dared, darity, dart, darted, darth, dartt, darty, dearth, dehart, dehydrate, derida, deride, derided, derward, deteriorate, deteriorated, deterred, detert, detoured, detroit, dewaard, dewart, deweerd, diehard, diorite, dirt, dirty, doherty, dorado, dorette, doretti, dority, dorotea, dorothea, dorothy, dort, dorta, dorthea, dorthy, dorward, dorwart, drawdy, dread, dreaded, dred, dredd, drewett, dried, droddy, druid, duarte, duhart, durette, durrett, durward