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