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.
bowfins boffins biffins bovines beefiness buffoons
bowfins fins defines ruffians refines puffins muffins coffins boffins caffeins biffins affines foins finos finis fines tiffins