Bostonians rhymes with:
albanians, amazonians, argentinians, armenians, athenians, augustinians, babylonians, bosnian's, bosnians, caledonian's, carolinians, chechnyan's, chechnyans, estonians, finian's, indianians, iranians, iranians', jacksonians, jeffersonians, jordanians, lithuanians, louisianians, oregonians, orleanians, palestinian's, palestinians, palestinians', panamanians, pennsylvanians, romanians, smithsonian's, stepanian's, ukrainian's, ukrainians, washingtonians
Bostonians sounds like:
babysitting, backdating, bagdonas, basting, bastions, begetting, besetting, besting, bestowing, biosystems, boasting, bogdanowicz, bogdanski, boosting, boston's, boycotting, busting