Here's what rhymes with proportioun.
soon foon shoon moon noon tune spoon boon hewn shewn doin dune coon swoon loon rune goon racoon cartoon lagoon monsoon saloon strewn buffoon harpoon maroon pontoon prune raccoon typhoon bassoon attune croon poltroon immune balloon platoon cocoon forenoon opportune toluene aucune baboon dragoon tycoon festoon jejune lampoon spittoon doubloon patroon protozoon afternoon honeymoon tablespoon impugn importune picayune bestrewn macaroon inopportune spermatozoon dessertspoon trinitrotoluene Words that almost rhyme with proportioun
whom zoom room assume boom resume tomb doom womb loom fume flume rheum bloom gloom presume broom groom plume suum boxroom foredoom costume consume perfume residuum subsume abloom entomb legroom exhume elbowroom strongroom