Ramthun rhymes with:
anthon, blethen, bothun, brethen, cauthen, cauthon, cawthon, donathan, dothan, earthen, elizabethan, ethan, johnathan, johnathon, jonathan, jonathon, jonothan, kathan, lathan, lathon, laythan, lecithin, lengthen, leviathan, louthan, mathan, mcclenathan, mcglothen, mcglothin, mckeithan, mckeithen, mckethan, midthun, mithun, mothon, nathan, pathan, snethen, strengthen, swaminathan, trefethen, trevathan, warthen, wathen, witthuhn, worthen
Ramthun sounds like:
ramadan, ramtane, random, remediation, rendina, rendition, rendon, renomination, renton, rondon, rondonia, rumination, run-down, rundown, rwandan, ryanodine