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.
sedum sodium stem stum satem sodom steam sodomy steamy stemma stemmy
sedum doum duma dumb bedim bedumb luteum medium odeum odium oidium podium radium sodium tedium
seed seedy sued suede pseud pseudo used