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.
unsay uns uneasy unnoisy unais unaus unsew unease unci
gainsay unsay weensy tansy linsey teensy donsy sensa pansy mensae mensa quinsy lunacy sonsy nays hansa bonsai ansae ansa nosy naysay guanays chainsaw