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