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.
ska skua sika sky sag suk sukkah ski sac saki sick seek sock syke souk sack soak suck sike skee sake soke sook soca skew sago saga squaw saiga saggy socko sucky sicko skiey sickee sickie zaikai