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.
tireder treader trader treater toreador torrider triter tarter trotter tartier dirtier tardier troutier darter tartar derider tartare torture traitor
tireder reader redear redry herder rider ruder reedier nerdier reorder parader tardier lowrider larder torrider greedier treader curdier warder corder wordier horrider shrewder joyrider redder boarder lardier harder forrader hardier breeder border ferreter murder predry order derider guarder birder arider grader trader cruder ureter carder weirder hoarder shredder girder yarder
tired tared teredo tiered tirade tread treed tried trued tyred