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.
cassatas casitas caseates cassettes cossets cuestas casts castes coasts caestus gussets casettes costs gasts cosets custos
cassatas vestas diastase cestas posadas pastas miseats lysates cuestas casitas hostas vistas fiestas satays eustasy stoas stays seats satis sates misseats pesetas reseats siestas disseats