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.
spills spails spiles spoils spells speils spalls spiels spales splays speels spools sepals sapless supples sepalous soapless soupless supplies splice
pills spills spoils spiels pilus spiles spells spalls repolls pails palls piles pilis speils paellas polls pulls apollos appalls huipiles huipils lapillus pupils spails poilus uppiles
spile spill spail spale spall speil spell spiel splay spoil espial