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