Slovonia rhymes with:
slavonia, slavonia, slavonia, slavonia, adonia, amazonia, ansonia, antonia, caledonia, colonia, cydonia, diaphonia, donia, estonia, gastonia, gonia, harmonia, idonia, latonia, macedonia, madonia, new-caledonia, omonia, patagonia, petronia, philharmonia, rondonia, sidonia, sinfonia, slavonia, sophronia, tonia, vernonia, vidonia
Slovonia sounds like:
salvina, salvino, schlobohm, sclafani, silvana, slaven, slavin, slavonia, slepian, sleven, slevin, slip-on, slovene, slovenia, slovenian, sullivan, sylvain, sylvan, sylvana, sylvania