Disparity rhymes with:
prosperity, parity, prosperity, celerity, clarity, dexterity, familiarity, geraghty, hilarity, irregularity, parity, peculiarity, polarity, popularity, posterity, prosperity, rarity, regularity, similarity, sincerity, solidarity, temerity, unfamiliarity, verity
Disparity sounds like:
dashboard, deciphered, despaired, desperado, desperate, disappeared, disbarred, discovered, disparate, dispirited