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.
souk suk sock suck zouk soak soke sook sucky socko sukkah ska ski sky suq scow syke sake sika saki skee sego sago soca seek skua sack sike sick skew segue sicko skiey soggy squaw