Cavities rhymes with:
sensitivities, annuities, authorities', authority's, availabilities, banalities, causalities, celebrities, celebrity's, charities', christianity's, community's, complexities, complicities, eccentricities, entities, entities', facility's, gratuities, humanities, humanity's, identities, illegalities, immunities, indemnities, inequalities, infidelities, infirmities, insecurities, instabilities, legalities, localities, majorities, maturities, municipalities, nationalities, necessities, niceties, obscenities, personalities, principalities, rarities, rigidities, sensibilities, sensitivities, trinity's, universities', varity's, vulnerabilities
Cavities sounds like:
cabot's, cabotage, capote's, cassavetes, caveats, cespedes, chavitz, chefitz, cheviots, chipetas, cockpits, copetas, coppedge, coptic, covets, covitz, cupids