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.
massa mass masa masse massy mas missay mess moss maes mays moas mesa muss miss messiah maws mossy messy mosso missy mussy mousse miaous miaows mos mus mis miso mace mise mews mazy maze muse mows moos
massa ass bioassay fossa fossae vasa casa cassia essay quass gassy asea massy ossa paisa passe sass tass tussah lass lasso bassy mass bass assay assai gauss quassia lassi bassi lyssa basso masa masse missay ossia pass wrasse sassy tasse chasse