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.
diastase deists disseats dusts diazotize tastes toasts diacids tassets deciduas dissuades tests testes testis tsadis tsetse
diastase stays stoas eustasy fiestas vestas vistas hostas casitas cassatas cuestas pastas pesetas cestas siestas chastise