Here's what rhymes with proportton.
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pardon tarpon carbon fortune garden margin boredom mortem warden harden sharpen cordon stardom resharpen postpartum caseharden misfortune hydrocarbon radiocarbon thraldom thralldom fluorocarbon portion proportion abortion bargain jargon parson torsion darken apportion barman barmen tauten foreign doctrine cotton adoption gotten foreman pollen rotten toxin wanton foremen hearken bobbin carmine talkin warren marlin corpsman harken bargeman coarsen gorgon reapportion sporran common fallen forgotten absorption sovereign caution distortion horsemen broaden cation shotgun soften trodden dolphin horseman robin sodden sportsman watchman konnen libation rosin sorption godson logon bondman bondmen contortion lawman motorman toboggan motormen bonbon conman yardman yardmen ramekin rontgen shodden uncommon precaution resorption befallen cauldron digoxin disproportion extortion reabsorption tryptophan decoction caldron marksman antiabortion bondsman longshoreman yachtsman cardamon retrodden infarction squadron concoction downtrodden unforgotten muskoxen postwomen exhaustion antitoxin endotoxin malabsorption herniation misbegotten calumniation prekindergarten