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.
sassier sissier saucier sizer seizer sizier seiser saucer suasory scissor scissure sizar cicero seisor seizor cesurae seisure seizure
bossier gassier wussier mossier pussier dossier massier sassier sissier hissier fussier mussier messier cusser lassoer sieur goosier kisser gasser sizer busier hisser issuer mousier pissoir hosier tosser osier mosser cheesier lousier hosiery fusser reissuer easier nosier newsier voussoir guesser queasier masseur lesser tusser passer cosier noisier rosier tessera pisser chasseur dosser choosier ser sir
sassies sass sassy assais assize cassias cassis lassies lassis sasses sissies dassies tassies