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.
sepoys spays seeps sepias ceps saps zeps sips sups spas sops spicy spaes spues cepes soups soaps spacy spews supes sipes spies spacey speiss spicey seapiece
sepoys tepoys teapoys typos appose spays repose repays pops pappous oppose coypous copays capos hoopoos hoopoes suppose depose pays epos pows topos hippos apos hypos repos pepos reoppose lupous pois poos pose posy pappose cheapos