Boltzmann's rhymes with:
boltzmanns, boltzmanns, boltzmanns, boltzmanns, mutzman's, statesman's, weitzman's, boltzmanns, congressman's, foxman's, glickman's, grossman's, heisman's, houseman's, mutzman's, policeman's, statesman's, wacksman's, waxman's, weitzman's
Boltzmann's sounds like:
bloodsucking, blotching, bludgeoning, boltzmanns, bulldozing