Plutonian rhymes with:
newtonian, bostonian, estonian, houstonian, newtonian, washingtonian, amazonian, andonian, apollonian, babylonian, bostonian, caledonian, devonian, draconian, estonian, gorgonian, houstonian, jacksonian, jeffersonian, melkonian, newtonian, oregonian, patagonian, simonian, smithsonian, usoniam, washingtonian
Plutonian sounds like:
paladin, paladino, palatine, paldon, palladino, palladium, pallidotomy, palton, pelton, piltdown, platen, platinum, platona, platoon, platten, plowden, plutonium, politano, pollution, poppleton, population, poulton