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