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