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.
fallowness fellness fullness fulness felonies foulness felons flanes villainess valines flounce felines valonias vileness violones flans felonious flense villainies flouncy valance valence valiance villains villeins
lowness fallowness hollowness callowness mellowness sallowness slowness shallowness lioness coolness