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.
prudery prouder predry prodder parader prater pretor porter pearter parador partier portray praetor purtier parroter parterre portiere prettier perter perdure
prudery rudery rudder ruder broidery cruder marauder murder prouder