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.
splays sepals spools spills spales speels spiles speils spells spalls spiels spails spoils sapless supples sepalous soapless soupless supplies splice zipless
plays replays splays byplays pulleys deploys cupolas copulas hooplas pleas polys ploys pilaws pilaus palais paellas whooplas
splay sepal spail spale spall spell spile spill