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.
toenails tenails tenailles denials toneless tunnels townless tuneless dunghills dynels
renails tenails snails unnails nails toenails nils hymnals canals denials manilas nills seniles menials annals pineals manuals annuals noils anneals biennials finales finalis finals finials vinals hymeneals anils nalas biennales
toenail tenail tenaille tonal tonally atonal atonally