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.
lupous lupus loups loupes laps lips lops lapis lapse leaps loops lopes lipase
lupous coypous pappous pus appose copious puss coypus oppose epos opus pappus capos hoopoes coups pappose pupus repos roups soups spues depose tepoys typos pops pepos hippos pious posy pose poos pois apos quippus hoopoos pows loups lupus quipus hypos pups reoppose repose sepoys spouse suppose teapoys topos cheapos