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