Here's what rhymes with retornable.
double bubble rubble publ tamable trouble stubble damnable friable redouble playable flyable addable dirigible vocable unplayable acquirable vincible beatable conformable nonviable attachable filtrable unnameable ignitable unlikable dividable unloveable imperishable uncharitable unbridgeable containable imperturbable indissoluble exploitable translatable unarguable compoundable transmutable untranslatable indemonstrable Words that almost rhyme with retornable
muddle couple subtle shuttle puddle suppl supple huddle tuple cuddle cudgel rappel fuddle rebuttal scuttle uncouple decouple befuddle thermocouple oversubtle muscle muzzle knuckle muffle mussel mumble nuzzle humble tunnel puzzle bustle funnel shovel tumble buckle chuckle jumble rumble rustle shuffle tional hovel hustle ruffle smuggle subtile fumble juggle suckle tussle bumble caecal runnel snaffle snuggle guzzle pummel duckbill gunnel snuffle tamale tousle gumball tubful mugful bundle jungle fungal crumble ductile nuptial stumble ductal grumble scuffle phrasal pustule reshuffle truffle bungle truckle lungful rumple unbuckle jugful tumbrel pinocle struggle frontal triumphal autumnal colourful crustal bestowal lustful carbuncle crumple prenuptial trundle nonvocal kerfuffle cupsful subcortical conformal honeysuckle peduncle suboptimal trustful granduncle prefrontal antifungal duodecimal heptagonal disgruntle distrustful mistrustful