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.
pastas pasts pastes pastis pasties pesetas posts pests passados passades pistes passadoes pestos posits pistous possets posties piosities pussytoes poussettes pseuds pesades posadas pseudos
fiestas siestas hostas pastas cestas cuestas vistas vestas jousts hastes costs boasts casitas sits hists rusts visits jests gestes geests fests hosts busts hygeists beasts rousts missets cassatas resets mists pesetas cosets caestus pests hests pastis kists fists assets posts cestos shists wists wests wastes toasts testis tastes dusts deists xystus xystos cysts cists roosts gusts oasts stays rests besets maists posits vests eustasy mozzettas sets zetas gussets mosts feasts guests bassets feists sots bests pastes quests possets leasts bastes pistes stoas roasts satays lists ghosts besots nests lusts gests basts fasts cossets hoists heists gasts joists casts vasts coasts gists keysets castes knessets resits foists wrests justs wrists musts hygieists masts pestos mozettas easts reests suttas lasts rosets ousts pasts boosts russets cestus cistus custos xysts zests diastase tassets testes tests waists wasts whists chests yeasts
past paste pastie pasty pasta pst postie post pistou pesty paused pesto pest passed passado passade psst piste