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.
wasts waists wastes wests wists whists waysides
beasts masts toasts easts lasts oasts leasts roasts gasts yeasts coasts vasts casts wasts fasts boasts basts feasts pasts custos gists hists hygieists lists hosts kists hests miseats fists reests hygeists pestos gussets mosts foists jests boosts bastes musts castes possets jousts cossets wrists xystus shists wists wests wastes busts rusts testis tastes dusts deists cistus pastis xystos costs cestus hastes roosts caestus quests besots lusts missets mists posits assets rousts maists joists pistes posts misseats hoists gests ghosts keysets pests sits knessets fests bassets justs ousts guests rests visits feists gestes nests besets heists resets bests wrests sots rosets pastes geests reseats seats gusts resits tests russets vests cists cestos cysts xysts zests disseats tassets testes waists sets whists chests cosets
wast waste waist wayside west wist wost