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