Relativity rhymes with:
insensitivity, nativity, negativity, activity, captivity, conductivity, creativity, festivity, insensitivity, nativity, negativity, productivity, radioactivity, reactivity, selectivity, superconductivity
insensitivity, nativity, negativity, activity, captivity, conductivity, creativity, festivity, insensitivity, nativity, negativity, productivity, radioactivity, reactivity, selectivity, superconductivity