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.
ski saki skiey sickie suk ska sic sky syke skee skua sick suck skew sook sika seek soak sack sake sock sike soke souk saiga sicko socko sucky sickee sukkah zaikai