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.
splice supplies spiles spales sapless supples soapless soupless spalls spiels speels spoils sepals spools spills speils spells spails splays zipless sepalous
police splice duopolies supplies replies replace reapplies populace applies noplace polies policy plies plaice place palace showplace
spail spale spall speil spell spiel spile spill splay spoil espial