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.
morro morrow mor marrow marrowy murr more moor mora moray marry murry moory murre merry moire morae myrrh murra moira murrey moirai mir mar mair miri mere mure mare mara mire mura maar miry
morro harrow churro worry toro sorry orra narrow morrow marrow lorry karroo furrow arrow farrow burrow burro borrow barrow barrio sorrow dorr torr charro yarrow