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.
snails seniles snells snools sinless sonless sunless snowless sinewless cineols
nails renails snails unnails tenails toenails biennales annuals nalas dunghills vinals manilas finials finals finalis finales biennials hymeneals denials anils anneals canals hymnals manuals pineals annals menials seniles noils nils nills