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.
cruder cruddier carder corder curdier crowder carter grader curter crater creator crittur grodier critter gridder courter grouter guarder greedier groutier courtier cowriter corduroy criteria creature corridor carrotier garter grater krater greater quarter curator greeter gritter garotter garroter grittier grottier quartier
ruder prouder marauder cruder murder warder prodder tireder broider prudery order reedier rowdier reader rudder border breeder arider trader shrewder wordier birder ruddier rudery brooder crowder hoarder rider raider grader gridder grouter larder lowrider derider curdier router greedier reorder treader harder tardier girder carder cruddier redear broodier broidery braider broader herder readier shredder torrider weirder horrider ridder joyrider corder grodier guarder lardier redder hardier forrader nerdier parader boarder yarder
crud cruddy crude card cardia cardiae cardio cord cred credo croute cruet curd curdy