Here's what rhymes with semiannual.
Words that almost rhyme with semiannual
valuable casual tangible mandible cannibal cantonal cantabile fanciable capital national radical rational invaluable maximal palpable taxable intangible factional fallible palatal sagittal laughable passable merchantable chasuble frangible satiable savable practical diagonal irrational adaptable fractional hexagonal impassable infallible pyramidal clavicle interactional tractable flammable impalpable verapamil madrigal blamable impassible bankable graspable international compatible implacable impractical intractable inflammable octagonal detachable collapsible expandable unpractical nontaxable retractable unflappable attractable grammatical understandable lnternational transactional nonflammable declarable incompatible multinational transnational supranational ungrammatical nondetachable extrapyramidal