Here's what rhymes with rotonin.
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toning boning bonging zoning moaning atoning droning honing loaning phoning stoning doming cloning combing foaming groaning roaming homing bemoaning buttoning disowning intoning rezoning tenoning cottoning postponing condoning gloaming blazoning chaperoning syphoning chroming telephoning unbuttoning backcombing emblazoning megaphoning honeycombing boatmen eosin tocsin yogin doeskin postmen spokesmen foreskin goatskin unwoven unfrozen