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.
town towny ton townie townee toon tone tony down tonne downy tauon tawny toney toonie tawney tan tin don ten tun tonneau dona teen tine tuna done tiny dawn tune tain tyne donee donna donne teeny tenia tinea tinny tunny
gown lown mown known own sown down town shown on