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.
litterer letterer loiterer literary
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
litter littery latter letter liter litre loiter lotter lottery flitter glitter glittery slitter slittier