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.
sac sack sic ska sec sag sake sock soak sago sika saga scow sick skua soca suck saki saggy saiga sicko socko squaw sucky sickee sickie sukkah