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.
sack sac soak sick suck sock saki sake sucky sicko socko sickee sickie ska suk sec sic sky ski sag skee souk soke sago saga sook scow seek sike soca skua skew sika syke saggy saiga skiey squaw
back hack jack quack lack mack knack pack rack wrack sack tack wack whack shack yack