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.
shafts shifts shivitis sheepheads cheviots
hafts rafts wafts shafts muftis lofts haffets fats gifts lefts befits efts fates vatus refits wefts soffits softs defeats tofts tufts buffets savates aviates caveats lovats vats fiats fets feats lifts haffits fatso sifts rifts fits softas defats deviates tuffets hefts ghats ghauts whiffets shifts
shaft chafed chaffed shaved sheafed sheaved shift shifty