Here's what rhymes with openable.
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genital urogenital congenital terrible parable bearable bendable sensible decimal legible testable tentacle wearable breathable spendable pentacle medical cerebral vegetable credible plentiful retinal sensual dependable pedestal unbearable attentional defensible illegible impeccable ineffable ostensible sentinel caramel inedible repairable amendable stretchable weldable spreadable quenchable chemical accessible dimensional flexible clerical festival spectacle intentional perceptible sectional textual commendable detectable directional insensible lamentable sceptical seminal detestable impregnable delectable digestible expendable obsessional presentable preventable dispensable extensible correctable impressible extendable perfectible preventible suppressible detectible electable unwearable professional acceptable numerical incredible intestinal perceptual respectable susceptible skeptical segmental correctional irrepressible polemical regrettable chimerical compressible execrable expressible extensional indefensible contestable processional prophetical collectible suggestible undependable collectable forgettable premedical recessional perceptional comestible connectable connectible conventional exceptional hypothetical indispensable biochemical inaccessible confessional contemptible inflexible receptacle reprehensible trigeminal unforgettable unintentional alchemical bidirectional geochemical indigestible photochemical twodimensional undetectable unquenchable concessional paramedical recommendable unpreventable complexional congressional homosexual unacceptable comprehensible inexpressible incompressible incontestable inflectional intracerebral psychosexual threedimensional unprofessional anticlerical insusceptible conceptional convectional inflexional nonclerical nonnumerical heterosexual unconventional unidirectional histochemical intertextual nonprofessional unexceptional subprofessional noncollectable multidimensional paraprofessional semiprofessional alphanumerical gastrointestinal physicochemical immunohistochemical