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