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