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