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.
duma douma doum dumb dummy duomo dumbo duomi dim dom dam demy dime dome doom deem deme dame demo doomy tummy
louma luma pneuma puma douma duma ma um