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.
secs sics sacs segs sakes segos scows sikes socas skews sykes seeks sokes skees sicks skies socks sacks sucks sickos segues sex sickies sickees sequoias sexy sags suqs suks skis skas sagas scuzz sakis sagos souks sooks skuas soaks sikas