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