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