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.
mar mair mara mare maar maria marry mor marrow mir marrowy miry miri moor mura murr mire more mere mure mora murry murre mbira merry moira moory moire moray morro murra morae myrrh moirai morrow murrey