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.
morassy morass moras morays mors morse moors mores muras maras mbiras morose murras morris moires morros morrows morceau mars mirs marse murrs mercy mares mures mirza mairs meres maars mires murres myrrhs marries marrows murreys murries
brassy grassy morassy trass dressy wrasse brass frass harass crass creasy cressy cuirass grass greasy morass prissy drossy tressy ras
mora moira moirai morae moray mor