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.
prouder prodder prudery parader parroter porter prater predry pretor partier pearter praetor parador purtier parterre portiere prettier perter perdure portray
prouder router prudery prodder murder marauder grouter grodier cruder crowder broodier rudder brooder broider broader border rudery ruder order corder reorder
proud prod parodoi parody pirouette prude sprout