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