Here's what rhymes with aprotonin.
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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 blazoning tenoning cottoning postponing condoning telephoning gloaming chaperoning syphoning chroming unbuttoning emblazoning backcombing megaphoning honeycombing boatmen eosin tocsin yogin doeskin postmen spokesmen foreskin goatskin unwoven unfrozen