Opacity rhymes with:
capacity, incapacity, overcapacity, audacity, capacity, incapacity, overcapacity, voracity, analyticity, animosity, atrocity, audacity, biodiversity, capacity, complexity, complicity, curiosity, density, diversity, domesticity, eccentricity, elasticity, electricity, falsity, felicity, ferocity, generosity, incapacity, intensity, laxity, monstrosity, necessity, obesity, overcapacity, paucity, perplexity, perversity, publicity, religiosity, simplicity, specificity, toxicity, university, velocity, viscosity, voracity
Opacity sounds like:
obesity, obfuscate, object, objected, oboist, obsessed, obst, officiate, officiated, offset, offshoot, opposed, opposite