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.
soca sock soak socko sec sac sag sic ska sequoia sago sake skua sook sego saki sack sick saga soke ceca souk sika suck scow zoic saggy saiga sicko soggy squaw sucky