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.
potterer patterer putterer pewterer powderer
batterer potterer waterer patterer caterer putterer chatterer loiterer totterer bitterer titterer litterer letterer fetterer shatterer mutterer utterer miterer pewterer maturer storer deterrer jitterier steerer retirer dearer tearer powderer butterier waterier starer dodderer
potter pottery patter petter pottier pouter powter putter spotter spottier