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.
ungual ungula unequal ungulae unequally unglue uniquely uncle uncoil uncool
lingual ungual fungal hangul gingal gingall jingal jingall lingula nonequal cingula unequal ungula