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