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.
powderer pewterer potterer patterer putterer
powderer dodderer chatterer waterer totterer darer pewterer mutterer direr drear tearer adorer batterer bitterer dearer butterier caterer fetterer letterer litterer loiterer miterer patterer potterer putterer deterrer jitterier steerer titterer utterer waterier shatterer