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