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