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.
ridders riders rudders redders raiders redears writers rioters readers ritters ruderies readdress retros radars raters ratters retries routers redress retears redraws rotters rooters retires redries retirees reutters rotaries retrousse rotors retrace
bedders rudders ridders fodders dodders madders tedders bidders gadders judders kidders mudders nodders shudders chudders ladders shedders wedders redders adders wadders codders widders budders udders padders ceders laders biders seeders lauders guiders needers readers hiders waders powders cheders eiders ciders aiders riders deers cyders headers tidiers chuddars dears chiders loaders seders leaders heders coders heeders redears weeders cheddars doers kneaders siddurs raiders voiders feeders beaders shaders faders chowders
ridder raider redder rider rudder arider gridder