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.
custos cuestas gustoes gusts costs casts castes quests coasts guests casitas gussets casettes caseates cassatas coesites gasts kists cassettes cosets caestus cossets keysets
custos xystos pestos cestos cosets zests fists foists gests missets geests guests keysets mists vests mosts sets fasts casts hostas rosets wests busts boasts tastes caestus stoss gustoes posts jests vistas heists fiestas maists leasts sots sods shists knessets wrests besets cestas reests hists cestus russets cistus siestas roasts xysts dusts testis wastes wists hygeists pastas acetose sits setous acetous vasts posits oasts pistes lusts quests rests resits costs bestows toasts stoas pastis joists basts coasts castes gists gestes ghosts wrists feists cossets assets testes setose hygieists whists hests bassets lasts feasts visits maestoso bastes lists justs stows jousts boosts hastes hosts gussets rusts fests easts cysts deists waists pests hoists vestas besots kists cuestas musts masts gasts pasts pastes cists bests beasts chests rousts wasts tests tassets xystus gusts pistous roosts possets nests risottos resods ousts resets pussytoes yeasts
cast caste caused cost costa costae cuesta cussed gust gusto gusty