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.
grodier greedier grottier groutier grader guarder curdier gridder gritter grouter crowder garroter grittier garotter cruddier carrotier cruder garter carder grater corder greeter greater critter cowriter quartier criteria courtier krater curter crater carter courter creator crittur curator quarter
broodier grodier tardier prouder order lardier curdier cruddier crowder corder carrotier hardier broider brooder broader border ruddier rowdier rootier reedier greedier readier nerdier prodder reorder wordier