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.
loquacity laxity luckiest locust luxate lakiest lockset locusta lookist leakiest locustae loggiest leucocyte leukocyte
loquacity sequacity fugacity megacity sagacity