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.
parader parador prater prodder praetor prudery pearter prouder partier parterre parroter pretor porter predry purtier portiere prettier perter perdure portray
forrader trader parader grader birder hardier lardier cruder harder herder horrider readier girder curdier crater murder wordier warder krater corder nerdier carder reader ruder prater derider tireder rider marauder raider barrater broader treader tardier grater frater joyrider rater irater boarder border braider arider reorder weirder torrider parador hoarder radar guarder larder lowrider mirador narrater order yarder
parade pard pardah pardee pardi pardie pardy pared parodoi parody