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.
deepen depone teopan tiepin doupioni tuppenny
deepen pen shapen tiepin ripen loupen spean repin reopen rappen open kneepan kippen peen keppen pean copen happen peon pein lippen cheapen shippen