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