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.
muftis mephitis mofettes moffettes mights
muftis efts hafts gifts haffets fifties haffits righties softas sifts softs nighties defats refits naughties tofuttis buffets tufts lofts wafts lefties whiffets levities shifts hefts eighties fats rifts fets fids cavities footies befits fits safeties softies soffits suavities rafts fatties tofts nifties tuffets naiveties uveitis mephitis wefts lefts shafts lifts shivitis