Trinity's rhymes with:
christianity's, community's, humanities, humanity's, immunities, indemnities, obscenities, annuities, authorities', authority's, availabilities, banalities, causalities, cavities, 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, universities', varity's, vulnerabilities
Trinity's sounds like:
taranto's, terminates, termites, thermedics, thermits, thorndike, thorndike's, thorndikes, thorndyke, thurmond's, torments, tornadic, tornado's, tornadoes, tornados, toronto's, torrents, tournament's, tournaments, tournedos, traumatic, traumatize, tremendous, trends, trent's, trintex, turnouts, tyrants