Inability rhymes with:
sustainability, accessibility, advisability, believability, comparability, credibility, culpability, deniability, dependability, desirability, disability, durability, eligibility, enforceability, favorability, flammability, gullibility, inevitability, instability, invincibility, invulnerability, liability, maneuverability, marketability, permeability, portability, predictability, profitability, readability, respectability, stability, suitability, survivability, sustainability, taxability, transferability, unavailability, unbreakability, unpredictability, unprofitability, unreliability, variability, visibility, vulnerability
Inability sounds like:
immobility, impaled, impelled, implied, implode, imploded, impolite, infield, inflate, inflated, invalid, invalidate, invalidated, inviolate