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.
eustasy eustacy easts
eustasy cassatas diastase siestas cestas pesetas pastas cuestas casitas stays hostas vistas vestas fiestas eustacy stoas testacy