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