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.
butterier batterer bitterer bioterror
butterier jitterier waterier trier letterer chatterer utterer couturier waterer miterer totterer loiterer deterrer litterer putterer caterer mutterer pewterer bitterer batterer terrier tearier tearer patterer potterer roturier fetterer titterer shatterer
buttery butter batter batterie battery better bitter abutter