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.
lardier larder lowrider
hardier lardier tardier curdier nerdier wordier ruder broodier dirtier hoarder harder readier writer courtier guarder reorder grader cruddier order forrader rider rowdier ruddier lowrider tartier torrider triter wartier purtier heartier shirtier larder carder corder joyrider quartier reedier rewriter derider girder border artier cruder greedier boarder murder grodier arider cowriter birder horrider herder partier parader tireder trader warder weirder chertier yarder
lard laird lardy lariat liard clarity