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.
syke skee soke sike sake skew sickee sickie sky ski suk ska sec seg sook sika sego suck sack soak seek sick souk skua sock saki saggy segue sicko skiey socko soggy sucky