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.
soma som sima some summa samba summae sim sum same semi sumo seem smew cyma seam seme zoom cymae sambo seamy zamia zombi