Impurities rhymes with:
securities, securities', security's, securities, securities', security's, authorities, charities, charity's, disparities, irregularities, majority's, minorities, parities, peculiarities, priorities, securities, securities', security's, similarities, solidarity's, sororities, unfamiliarities, verities, verity's
Impurities sounds like:
imparts, imports, imports', inebriates, infuriates