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.
fiestas fists fests vestas vistas foists feists feasts fasts vests visits vestees fastuous vasts facets ghosts faucets
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
fiesta fest fist feast feist feisty foist