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.
speels spiels speils spells spails spales spoils sepals spalls spiles spills splays spools sapless supples sepalous soapless soupless supplies splice
speels peels tupelos peals peles pollees appeals appellees appels lapels cupels rappels repeals repels speils spells spiels chapels