I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
myrrhs murrs morros murras murres morris murries marrows murreys morrows marries mors mirs mars marse mairs moras maars muras meres mores maras mires mares moors morse mures mbiras moires morass morays morose
myrrhs gharris jarrahs currs hurrahs horahs gerahs surras durras dorrs tarres sierras torahs sirras purrs whirrs orris charrs arris chirrs morros churrs murres shirrs carrs hoorahs errs surahs barres birrs morris burros burrs burghs derris durrs dourahs terras sirrahs arras torrs cirrus charros parrs chirres gnarrs churros murras sherris murrs yirrs
myrrh marrow marrowy marry merry morro morrow murr murra murre murrey murry