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.
desand descend designed descent dizened dozened disendow decent docent dissent disowned disunity duecento teosinte
desand weasand wessand sand missend resend puissant pissant peasant passant jessant bausond sned send saned sandy weazand pheasant