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.
greedier greeter grodier grader gritter guarder gridder greater curdier grittier groutier cruddier grottier grater corder carder cruder garter crowder grouter critter garotter garroter courtier cowriter criteria quartier carrotier carter crater curter krater
greedier reedier shredder treader tardier reader readier redder redear rowdier ruddier broodier breeder hardier cruddier curdier grodier lardier nerdier tireder wordier shrewder
greed greedy creed gored greet agreed