Beethovenian rhymes with:
slovenian, armenian, athenian, fenian, slovenian, tyrrhenian, albanian, amazonian, andonian, apollinian, apollonian, argentinian, armenian, arslanian, aslanian, athenian, augustinian, babylonian, bahrainian, bosnian, bostonian, caledonian, carolinian, carthaginian, chechnyan, darwinian, devonian, draconian, estonian, fenian, finian, flaminian, gorgonian, houstonian, hovnanian, indianian, iranian, jacksonian, jeffersonian, jordanian, lithuanian, louisianian, mediterranean, melkonian, murnian, newtonian, o'hanian, ohanian, oregonian, orleanian, pakistanian, palestinian, panamanian, patagonian, pennsylvanian, plutonian, pomeranian, romanian, rumanian, shahinian, simonian, slovenian, smithsonian, stepanian, subramanian, subterranean, tanzanian, tasmanian, tyrrhenian, ukrainian, usoniam, vartanian, washingtonian