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.
macro micro mucro makar maker micra mucor maigre maugre meagre megara mocker mucker muggar mockery muckier
macro crow karoo acre buckaroo buckayro fiacre jackaroo micro mucro nacre picaro sacra saguaro