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.
spoils spiels spills spools spiles spails speils spells speels spalls splays spales sepals sapless supples sepalous soapless soupless supplies zeppoles splice
spoils polos dipoles spools spills spiels spails pupils cupolas huipils huipiles pools polys pols pails piles polis poles poilus pilus pills pilis maypoles repolls speils spiles polls zeppoles uppiles
spoil spail speil spiel spile spill spool espial