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.
dona donna don down done downy donee donne donnee duenna dan den ton din dun tonneau dine toon deni dean dawn dyne dene dino dune deny tony town tone tuna deign diene tauon tenia tinea toney tonne danio towny