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.
spalls spales spells spills sepals spails sepalous spoils speels spiels speils spiles spools splays sapless supples soapless soupless supplies splice
appalls palls spalls tapalos spells repolls palsy spales sepals repeals opals nopales keypals paellas pails pales pals pawls pills polls pulls apollos appals appeals copals lapillus nopals peals pipals spills spails tepals
spale spall sepal spail spell spile spill splay