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