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.
narrater narrator nurture
rater barrater narrater frater krater crater prater grater irater artier ratter curator grader courter hurter parroter perter carter porter writer barrator phratry artery purtier sorter deaerator hydrator tartier treater ureter charter aerator shirtier garroter quarter barratry darter courtier gyrator heartier curter pearter forrader quartier ferreter narrator barter cowriter greater partier garter rewriter orator dirtier tarter trader triter wartier chertier parader shorter