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.
steerer starer storer stirrer starrier
steerer tearer chatterer waterer totterer dodderer litterer powderer batterer bitterer butterier fetterer jitterier caterer letterer dearer loiterer miterer mutterer patterer pewterer potterer putterer deterrer titterer utterer waterier shatterer
steer seder stere stereo aster asteria ester