Mesopotamians rhymes with:
damien's, damien's, abkhazians, accordions, aeriens, albanians, algerians, aliens, allianz, amazonians, amphibians, arabians, arcadians, argentinians, armenians, assyrians, athenians, augustinians, austrians, avions, babylonians, barbarians, bilzerian's, biospherians, bolivians, bosnian's, bosnians, bostonians, brobdingnagians, bulgarians, burgundians, caledonian's, cambodians, cambrian's, canadian's, canadians, canadians', carolinians, carrian's, centenarians, champion's, champions, chechnyan's, chechnyans, chileans, colombians, columbians, comedian's, comedians, contrarians, custodians, damien's, davidian's, davidians, deukmejian's, didion's, disciplinarians, dorians, episcopalians, estonians, ethiopians, fijians, finian's, floridians, galleons, gibian's, guardian's, guardians, hadrian's, halcion's, historians, homosapiens, humanitarians, hungarians, indian's, indianians, indians, indians', indonesians, iranians, iranians', ivorians, jacksonians, jeffersonians, jersians, jordanians, kazarian's, kentuckians, kerkorian's, kevorkian's, keynesians, latvians, lesbians, liberians, libertarians, librarians, libyans, lillian's, lithuanians, louisianians, marian's, marion's, menasion's, meridian's, mississippians, missourians, napoleon's, nigerians, olympians, oregonians, orlean's, orleanians, orleans, palestinian's, palestinians, palestinians', panamanians, parisians, parliamentarians, pedestrians, pelagians, pennsylvanians, peruvians, philadelphians, presbyterians, romanians, sapiens, scandinavians, scorpions, seminarians, serbian's, serbians, singaporeans, smithsonian's, stepanian's, symbion's, syrians, tallahasseans, totalitarians, ukrainian's, ukrainians, utopians, vegetarians, veterinarians, victorians, washingtonians, zairian's, zairians