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.
siestas cestas cists zests cestos cestus cistus seasides suicides zoisites cysts societies xysts xystos xystus secedes
fiestas siestas vestas cuestas cestas beasts reests fests caestus mozzettas leasts feists guests cestos eustasy heists hygieists cassatas gests geests hests vistas vests pastas casitas deists testes tests chests wrests stoas stays jests cestus hygeists easts mozettas quests bests gestes hostas pestos zetas resits besots feasts besets nests pesetas pests resets rests zests diastase testis wests yeasts